diff --git a/lib/function/study_preset_controller.dart b/lib/function/study_preset_controller.dart
new file mode 100644
index 0000000..65ac662
--- /dev/null
+++ b/lib/function/study_preset_controller.dart
@@ -0,0 +1,125 @@
+// 🍅 뽀모도로 루틴 공유(다른 학생과 공부/휴식 시간 조합 공유) 화면의 기능(서버 통신/상태) 담당 컨트롤러.
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import '../config.dart';
+
+class StudyPresetController extends ChangeNotifier {
+  final String studentId;
+  final String studentName;
+
+  StudyPresetController({required this.studentId, required this.studentName});
+
+  bool _isLoading = true;
+  bool _isBusy = false;
+  String _sort = 'popular'; // popular / recent
+  List<dynamic> _presets = [];
+  bool _disposed = false;
+
+  bool get isLoading => _isLoading;
+  bool get isBusy => _isBusy;
+  String get sort => _sort;
+  List<dynamic> get presets => _presets;
+
+  void _safeNotify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+
+  Future<void> init() => fetchPresets();
+
+  Future<void> setSort(String sort) async {
+    if (_sort == sort) return;
+    _sort = sort;
+    await fetchPresets();
+  }
+
+  Future<void> fetchPresets() async {
+    _isLoading = true;
+    _safeNotify();
+    try {
+      final response = await http.get(
+        Uri.parse('$baseUrl/api/study/presets?sort=$_sort'),
+      );
+      if (response.statusCode == 200) {
+        final data = jsonDecode(utf8.decode(response.bodyBytes));
+        _presets = data['presets'] ?? [];
+      }
+    } catch (_) {
+      // 조용히 무시 - 마지막으로 받아온 목록을 유지한다.
+    } finally {
+      _isLoading = false;
+      _safeNotify();
+    }
+  }
+
+  Future<(bool success, String message)> share({
+    required String title,
+    required int studyMinutes,
+    required int breakMinutes,
+  }) async {
+    _isBusy = true;
+    _safeNotify();
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/study/presets'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({
+          "studentId": studentId,
+          "studentName": studentName,
+          "title": title.trim(),
+          "studyMinutes": studyMinutes,
+          "breakMinutes": breakMinutes,
+        }),
+      );
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+      if (response.statusCode == 200 && result['status'] == 'success') {
+        await fetchPresets();
+        return (true, '${result['message'] ?? '루틴을 공유했습니다.'}');
+      }
+      return (false, '${result['message'] ?? '루틴 공유 실패'}');
+    } catch (e) {
+      return (false, '네트워크 에러: $e');
+    } finally {
+      _isBusy = false;
+      _safeNotify();
+    }
+  }
+
+  /// 다른 학생의 루틴을 내 설정으로 적용할 때 호출 - 인기도(사용 횟수)만 올려준다.
+  Future<void> markUsed(int presetId) async {
+    try {
+      await http.post(Uri.parse('$baseUrl/api/study/presets/$presetId/use'));
+    } catch (_) {
+      // 인기도 집계 실패는 조용히 무시 - 적용 자체는 이미 끝난 뒤라 영향 없다.
+    }
+  }
+
+  Future<(bool success, String message)> delete(int presetId) async {
+    _isBusy = true;
+    _safeNotify();
+    try {
+      final response = await http.delete(
+        Uri.parse('$baseUrl/api/study/presets/$presetId'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"studentId": studentId}),
+      );
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+      if (response.statusCode == 200 && result['status'] == 'success') {
+        await fetchPresets();
+        return (true, '${result['message'] ?? '삭제되었습니다.'}');
+      }
+      return (false, '${result['message'] ?? '삭제 실패'}');
+    } catch (e) {
+      return (false, '네트워크 에러: $e');
+    } finally {
+      _isBusy = false;
+      _safeNotify();
+    }
+  }
+}
diff --git a/lib/ui/study_preset_screen.dart b/lib/ui/study_preset_screen.dart
new file mode 100644
index 0000000..65dc100
--- /dev/null
+++ b/lib/ui/study_preset_screen.dart
@@ -0,0 +1,324 @@
+// 🍅 뽀모도로 루틴 공유 화면 (UI 전용). 다른 학생들이 올린 공부/휴식 시간 조합을 보고
+// 그대로 적용하거나, 내가 쓰는 조합을 이름 붙여 공유할 수 있다.
+// 서버 통신/상태는 lib/function/study_preset_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/study_preset_controller.dart';
+import '../theme/app_palette.dart';
+import 'app_notice.dart';
+import 'title_pill.dart';
+
+class StudyPresetScreen extends StatefulWidget {
+  final String studentId;
+  final String studentName;
+  final int initialStudyMinutes;
+  final int initialBreakMinutes;
+
+  const StudyPresetScreen({
+    super.key,
+    required this.studentId,
+    required this.studentName,
+    required this.initialStudyMinutes,
+    required this.initialBreakMinutes,
+  });
+
+  @override
+  State<StudyPresetScreen> createState() => _StudyPresetScreenState();
+}
+
+class _StudyPresetScreenState extends State<StudyPresetScreen> {
+  late final StudyPresetController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = StudyPresetController(
+      studentId: widget.studentId,
+      studentName: widget.studentName,
+    );
+    _controller.init();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  Future<void> _apply(dynamic preset) async {
+    await _controller.markUsed(preset['id'] as int);
+    if (!mounted) return;
+    Navigator.of(context).pop({
+      'studyMinutes': preset['studyMinutes'] as int,
+      'breakMinutes': preset['breakMinutes'] as int,
+    });
+  }
+
+  Future<void> _delete(int presetId) async {
+    final (_, message) = await _controller.delete(presetId);
+    if (!mounted) return;
+    AppNotice.show(context, message);
+  }
+
+  Future<void> _showShareDialog() async {
+    final titleController = TextEditingController();
+    int studyMinutes = widget.initialStudyMinutes;
+    int breakMinutes = widget.initialBreakMinutes;
+
+    await showModalBottomSheet<void>(
+      context: context,
+      isScrollControlled: true,
+      backgroundColor: AppPalette.paper,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
+      ),
+      builder: (sheetContext) {
+        return StatefulBuilder(
+          builder: (sheetContext, setSheetState) {
+            return Padding(
+              padding: EdgeInsets.only(
+                left: 20,
+                right: 20,
+                top: 20,
+                bottom: MediaQuery.of(sheetContext).viewInsets.bottom + 20,
+              ),
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                crossAxisAlignment: CrossAxisAlignment.stretch,
+                children: [
+                  const Text(
+                    '내 루틴 공유하기',
+                    style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
+                  ),
+                  const SizedBox(height: 12),
+                  TextField(
+                    controller: titleController,
+                    maxLength: 30,
+                    decoration: InputDecoration(
+                      hintText: '루틴 이름 (예: 불태우는 금요일)',
+                      filled: true,
+                      fillColor: AppPalette.mist,
+                      border: OutlineInputBorder(
+                        borderRadius: BorderRadius.circular(12),
+                        borderSide: BorderSide.none,
+                      ),
+                    ),
+                  ),
+                  _minuteRow(
+                    label: '공부 시간',
+                    minutes: studyMinutes,
+                    onChanged: (v) => setSheetState(() => studyMinutes = v),
+                  ),
+                  _minuteRow(
+                    label: '휴식 시간',
+                    minutes: breakMinutes,
+                    onChanged: (v) => setSheetState(() => breakMinutes = v),
+                  ),
+                  const SizedBox(height: 12),
+                  ElevatedButton(
+                    style: ElevatedButton.styleFrom(
+                      backgroundColor: AppPalette.ink,
+                      foregroundColor: AppPalette.paper,
+                      padding: const EdgeInsets.symmetric(vertical: 14),
+                    ),
+                    onPressed: () async {
+                      final (success, message) = await _controller.share(
+                        title: titleController.text,
+                        studyMinutes: studyMinutes,
+                        breakMinutes: breakMinutes,
+                      );
+                      if (sheetContext.mounted) {
+                        Navigator.of(sheetContext).pop();
+                      }
+                      if (!mounted) return;
+                      AppNotice.show(
+                        context,
+                        message,
+                        icon: success
+                            ? Icons.check_circle_rounded
+                            : Icons.error_outline_rounded,
+                      );
+                    },
+                    child: const Text('공유하기'),
+                  ),
+                ],
+              ),
+            );
+          },
+        );
+      },
+    );
+  }
+
+  Widget _minuteRow({
+    required String label,
+    required int minutes,
+    required ValueChanged<int> onChanged,
+  }) {
+    return Row(
+      children: [
+        Expanded(
+          child: Text(
+            label,
+            style: const TextStyle(fontWeight: FontWeight.w600),
+          ),
+        ),
+        IconButton(
+          icon: const Icon(Icons.remove_circle_outline_rounded),
+          onPressed: minutes > 5 ? () => onChanged(minutes - 5) : null,
+        ),
+        SizedBox(
+          width: 48,
+          child: Text(
+            '$minutes분',
+            textAlign: TextAlign.center,
+            style: const TextStyle(fontWeight: FontWeight.bold),
+          ),
+        ),
+        IconButton(
+          icon: const Icon(Icons.add_circle_outline_rounded),
+          onPressed: minutes < 120 ? () => onChanged(minutes + 5) : null,
+        ),
+      ],
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        final presets = _controller.presets;
+        return Scaffold(
+          backgroundColor: AppPalette.mist,
+          appBar: AppBar(
+            backgroundColor: Colors.transparent,
+            foregroundColor: AppPalette.ink,
+            elevation: 0,
+            centerTitle: true,
+            title: const TitlePill('뽀모도로 루틴 공유'),
+          ),
+          floatingActionButton: FloatingActionButton.extended(
+            backgroundColor: AppPalette.ink,
+            foregroundColor: AppPalette.paper,
+            onPressed: _showShareDialog,
+            icon: const Icon(Icons.ios_share_rounded),
+            label: const Text('내 루틴 공유'),
+          ),
+          body: Column(
+            children: [
+              Padding(
+                padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
+                child: Row(
+                  children: [
+                    _sortChip('popular', '인기순'),
+                    const SizedBox(width: 8),
+                    _sortChip('recent', '최신순'),
+                  ],
+                ),
+              ),
+              Expanded(
+                child: _controller.isLoading
+                    ? const Center(child: CircularProgressIndicator())
+                    : presets.isEmpty
+                    ? const Center(
+                        child: Text(
+                          '아직 공유된 루틴이 없어요.\n첫 루틴을 공유해보세요.',
+                          textAlign: TextAlign.center,
+                          style: TextStyle(color: Colors.grey),
+                        ),
+                      )
+                    : ListView.builder(
+                        padding: const EdgeInsets.symmetric(
+                          horizontal: 16,
+                          vertical: 8,
+                        ),
+                        itemCount: presets.length,
+                        itemBuilder: (context, index) {
+                          final preset = presets[index];
+                          final bool isMine =
+                              preset['studentId'] == widget.studentId;
+                          return Container(
+                            margin: const EdgeInsets.only(bottom: 10),
+                            padding: const EdgeInsets.all(16),
+                            decoration: BoxDecoration(
+                              color: AppPalette.paper,
+                              borderRadius: BorderRadius.circular(14),
+                              border: Border.all(color: AppPalette.sage),
+                            ),
+                            child: Row(
+                              children: [
+                                Expanded(
+                                  child: Column(
+                                    crossAxisAlignment:
+                                        CrossAxisAlignment.start,
+                                    children: [
+                                      Text(
+                                        preset['title'] ?? '',
+                                        style: const TextStyle(
+                                          fontWeight: FontWeight.bold,
+                                          fontSize: 15,
+                                        ),
+                                      ),
+                                      const SizedBox(height: 4),
+                                      Text(
+                                        '공부 ${preset['studyMinutes']}분 · 휴식 ${preset['breakMinutes']}분',
+                                        style: const TextStyle(
+                                          color: AppPalette.ink,
+                                          fontSize: 13,
+                                        ),
+                                      ),
+                                      const SizedBox(height: 4),
+                                      Text(
+                                        '${preset['studentName'] ?? ''} · 사용 ${preset['useCount'] ?? 0}회',
+                                        style: const TextStyle(
+                                          color: Colors.grey,
+                                          fontSize: 11.5,
+                                        ),
+                                      ),
+                                    ],
+                                  ),
+                                ),
+                                if (isMine)
+                                  IconButton(
+                                    icon: const Icon(
+                                      Icons.delete_outline_rounded,
+                                      color: Colors.grey,
+                                    ),
+                                    onPressed: () =>
+                                        _delete(preset['id'] as int),
+                                  ),
+                                ElevatedButton(
+                                  style: ElevatedButton.styleFrom(
+                                    backgroundColor: AppPalette.ink,
+                                    foregroundColor: AppPalette.paper,
+                                  ),
+                                  onPressed: () => _apply(preset),
+                                  child: const Text('적용'),
+                                ),
+                              ],
+                            ),
+                          );
+                        },
+                      ),
+              ),
+            ],
+          ),
+        );
+      },
+    );
+  }
+
+  Widget _sortChip(String value, String label) {
+    final bool selected = _controller.sort == value;
+    return ChoiceChip(
+      label: Text(label),
+      selected: selected,
+      onSelected: (_) => _controller.setSort(value),
+      selectedColor: AppPalette.ink,
+      labelStyle: TextStyle(
+        color: selected ? Colors.white : AppPalette.ink,
+        fontWeight: FontWeight.bold,
+      ),
+    );
+  }
+}
diff --git a/lib/ui/study_timer_screen.dart b/lib/ui/study_timer_screen.dart
index 840febd..0a83c0f 100644
--- a/lib/ui/study_timer_screen.dart
+++ b/lib/ui/study_timer_screen.dart
@@ -5,6 +5,7 @@ import '../function/study_timer_controller.dart';
 import '../theme/app_palette.dart';
 import 'app_notice.dart';
 import 'launchpad_transition.dart';
+import 'study_preset_screen.dart';
 import 'study_ranking_screen.dart';
 import 'title_pill.dart';
 
@@ -168,6 +169,37 @@ class _StudyTimerScreenState extends State<StudyTimerScreen> {
                     enabled: canEdit,
                     onChanged: (v) => setSheetState(() => breakMinutes = v),
                   ),
+                  const SizedBox(height: 10),
+                  OutlinedButton.icon(
+                    icon: const Icon(Icons.groups_rounded, size: 18),
+                    label: const Text('친구들이 공유한 루틴 보기 / 공유하기'),
+                    onPressed: () async {
+                      final result = await pushLaunchpad<Map<String, int>>(
+                        sheetContext,
+                        (context) => StudyPresetScreen(
+                          studentId: widget.studentId,
+                          studentName: widget.studentName,
+                          initialStudyMinutes: studyMinutes,
+                          initialBreakMinutes: breakMinutes,
+                        ),
+                      );
+                      if (result == null) return;
+                      if (!canEdit) {
+                        if (sheetContext.mounted) {
+                          AppNotice.show(
+                            sheetContext,
+                            '타이머가 멈춰있을 때만 루틴을 적용할 수 있어요.',
+                          );
+                        }
+                        return;
+                      }
+                      setSheetState(() {
+                        studyMinutes = result['studyMinutes']!;
+                        breakMinutes = result['breakMinutes']!;
+                        enabled = true;
+                      });
+                    },
+                  ),
                   const SizedBox(height: 18),
                   ElevatedButton(
                     style: ElevatedButton.styleFrom(