diff --git a/lib/function/study_timer_controller.dart b/lib/function/study_timer_controller.dart
index 96f78ed..6e4fcbc 100644
--- a/lib/function/study_timer_controller.dart
+++ b/lib/function/study_timer_controller.dart
@@ -3,10 +3,18 @@ import 'dart:async';
 import 'dart:convert';
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
+import 'package:shared_preferences/shared_preferences.dart';
 import '../config.dart';
 
 enum StudyTimerState { idle, running, paused }
 
+// 🍅 뽀모도로 진행 단계. study/break가 아니면(=null) 뽀모도로가 꺼져있거나 아직 시작 전.
+enum PomodoroPhase { study, breakTime }
+
+const String _prefPomodoroEnabled = 'study_pomodoro_enabled';
+const String _prefPomodoroStudyMinutes = 'study_pomodoro_study_minutes';
+const String _prefPomodoroBreakMinutes = 'study_pomodoro_break_minutes';
+
 class StudyTimerController extends ChangeNotifier {
   final String studentId;
   final String studentName;
@@ -24,11 +32,26 @@ class StudyTimerController extends ChangeNotifier {
   Timer? _ticker;
   bool _disposed = false;
 
+  bool pomodoroEnabled = false;
+  int studyMinutes = 50;
+  int breakMinutes = 10;
+  PomodoroPhase? _phase;
+  int _phaseSecondsLeft = 0;
+  int completedCycles = 0;
+  bool _phaseTransitioning = false;
+  Timer? _phaseTicker;
+
+  /// 🍅 뽀모도로 진행 상황이 바뀔 때(공부↔휴식 자동 전환) UI에 알림을 띄우기 위한 콜백.
+  /// 자동으로 일어나는 일이라 버튼 액션처럼 (bool,message)를 돌려줄 대상이 없어서 콜백으로 처리한다.
+  void Function(String message)? onPhaseChanged;
+
   bool get isLoading => _isLoading;
   bool get isBusy => _isBusy;
   bool get isRunning => _state == StudyTimerState.running;
   bool get isPaused => _state == StudyTimerState.paused;
   bool get isIdle => _state == StudyTimerState.idle;
+  PomodoroPhase? get phase => _phase;
+  int get phaseSecondsLeft => _phaseSecondsLeft;
 
   /// 지금 세션 하나만의 경과 시간(타이머 화면 큰 숫자용). 일시정지 중엔 멈춰 있다.
   int get liveElapsedSeconds {
@@ -51,6 +74,7 @@ class StudyTimerController extends ChangeNotifier {
   }
 
   Future<void> init() async {
+    await _loadPomodoroSettings();
     await _fetchStatus();
   }
 
@@ -58,9 +82,42 @@ class StudyTimerController extends ChangeNotifier {
   void dispose() {
     _disposed = true;
     _ticker?.cancel();
+    _phaseTicker?.cancel();
     super.dispose();
   }
 
+  Future<void> _loadPomodoroSettings() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      pomodoroEnabled = prefs.getBool(_prefPomodoroEnabled) ?? false;
+      studyMinutes = prefs.getInt(_prefPomodoroStudyMinutes) ?? 50;
+      breakMinutes = prefs.getInt(_prefPomodoroBreakMinutes) ?? 10;
+    } catch (_) {
+      // 조용히 무시 - 기본값(50/10)을 그대로 쓴다.
+    }
+  }
+
+  /// 뽀모도로 켜짐 여부와 공부/휴식 시간(분)을 저장한다. 타이머가 진행 중일 때 값이
+  /// 흔들리면 안 되므로, 화면에서 idle일 때만 호출하도록 막고 있다.
+  Future<void> setPomodoroSettings({
+    required bool enabled,
+    required int studyMinutes,
+    required int breakMinutes,
+  }) async {
+    pomodoroEnabled = enabled;
+    this.studyMinutes = studyMinutes;
+    this.breakMinutes = breakMinutes;
+    _safeNotify();
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setBool(_prefPomodoroEnabled, enabled);
+      await prefs.setInt(_prefPomodoroStudyMinutes, studyMinutes);
+      await prefs.setInt(_prefPomodoroBreakMinutes, breakMinutes);
+    } catch (_) {
+      // 조용히 무시 - 이번 세션 동안은 메모리 값으로라도 동작한다.
+    }
+  }
+
   Future<void> _fetchStatus() async {
     try {
       final response = await http.get(
@@ -108,7 +165,7 @@ class StudyTimerController extends ChangeNotifier {
   }
 
   Future<(bool success, String message)> start() async {
-    return _action(
+    final result = await _action(
       '/api/study/start',
       body: {"studentId": studentId, "studentName": studentName},
       onSuccess: (_) async {
@@ -116,6 +173,14 @@ class StudyTimerController extends ChangeNotifier {
         return '공부를 시작했습니다.';
       },
     );
+    if (result.$1 && pomodoroEnabled) {
+      completedCycles = 0;
+      _phase = PomodoroPhase.study;
+      _phaseSecondsLeft = studyMinutes * 60;
+      _startPhaseTicker();
+      _safeNotify();
+    }
+    return result;
   }
 
   Future<(bool success, String message)> pause() async {
@@ -139,7 +204,7 @@ class StudyTimerController extends ChangeNotifier {
   }
 
   Future<(bool success, String message)> stop() async {
-    return _action(
+    final result = await _action(
       '/api/study/stop',
       onSuccess: (result) async {
         await _fetchStatus(); // 오늘/이번주/전체 합계를 서버 값으로 다시 맞춘다.
@@ -148,6 +213,56 @@ class StudyTimerController extends ChangeNotifier {
         return '이번 공부 시간: $minutes분 기록 완료!';
       },
     );
+    if (result.$1) _stopPhaseTicker();
+    return result;
+  }
+
+  void _stopPhaseTicker() {
+    _phaseTicker?.cancel();
+    _phaseTicker = null;
+    _phase = null;
+    _phaseSecondsLeft = 0;
+  }
+
+  /// 🍅 1초마다 뽀모도로 남은 시간을 줄이고, 0이 되면 공부↔휴식을 자동으로 전환한다.
+  /// 휴식 구간에서도 계속 흘러야 해서, running일 때만 도는 _ticker와는 별도로 관리한다.
+  void _startPhaseTicker() {
+    _phaseTicker?.cancel();
+    _phaseTicker = Timer.periodic(const Duration(seconds: 1), (_) {
+      if (_phase == null || _phaseTransitioning) return;
+      _phaseSecondsLeft -= 1;
+      if (_phaseSecondsLeft <= 0) {
+        _advancePhase();
+      } else {
+        _safeNotify();
+      }
+    });
+  }
+
+  Future<void> _advancePhase() async {
+    _phaseTransitioning = true;
+    if (_phase == PomodoroPhase.study) {
+      final (success, _) = await pause();
+      if (success) {
+        completedCycles += 1;
+        _phase = PomodoroPhase.breakTime;
+        _phaseSecondsLeft = breakMinutes * 60;
+        onPhaseChanged?.call('공부 끝! $breakMinutes분간 쉬어가요.');
+      } else {
+        _phaseSecondsLeft = 1; // 네트워크 문제 등으로 실패했으면 잠시 후 다시 시도.
+      }
+    } else if (_phase == PomodoroPhase.breakTime) {
+      final (success, _) = await resume();
+      if (success) {
+        _phase = PomodoroPhase.study;
+        _phaseSecondsLeft = studyMinutes * 60;
+        onPhaseChanged?.call('휴식 끝! 다시 공부를 시작해요.');
+      } else {
+        _phaseSecondsLeft = 1;
+      }
+    }
+    _phaseTransitioning = false;
+    _safeNotify();
   }
 
   Future<(bool success, String message)> _action(
diff --git a/lib/ui/study_timer_screen.dart b/lib/ui/study_timer_screen.dart
index a97dcd0..840febd 100644
--- a/lib/ui/study_timer_screen.dart
+++ b/lib/ui/study_timer_screen.dart
@@ -34,9 +34,15 @@ class _StudyTimerScreenState extends State<StudyTimerScreen> {
       studentId: widget.studentId,
       studentName: widget.studentName,
     );
+    _controller.onPhaseChanged = _handlePhaseChanged;
     _controller.init();
   }
 
+  void _handlePhaseChanged(String message) {
+    if (!mounted) return;
+    AppNotice.show(context, message, icon: Icons.timer_rounded);
+  }
+
   @override
   void dispose() {
     _controller.dispose();
@@ -53,6 +59,24 @@ class _StudyTimerScreenState extends State<StudyTimerScreen> {
     return '$hh:$mm:$ss';
   }
 
+  String _formatMinSec(int totalSeconds) {
+    final s = totalSeconds < 0 ? 0 : totalSeconds;
+    final m = s ~/ 60;
+    final sec = s % 60;
+    return '$m:${sec.toString().padLeft(2, '0')}';
+  }
+
+  String _statusLabel(bool isRunning, bool isPaused) {
+    if (_controller.pomodoroEnabled && _controller.phase != null) {
+      return _controller.phase == PomodoroPhase.study
+          ? '뽀모도로 - 공부 중이에요'
+          : '뽀모도로 - 쉬는 중이에요';
+    }
+    if (isRunning) return '지금 공부 중이에요';
+    if (isPaused) return '일시정지 중이에요';
+    return '공부를 시작해볼까요?';
+  }
+
   String _formatHM(int totalSeconds) {
     final h = totalSeconds ~/ 3600;
     final m = (totalSeconds % 3600) ~/ 60;
@@ -72,6 +96,146 @@ class _StudyTimerScreenState extends State<StudyTimerScreen> {
     );
   }
 
+  Future<void> _showPomodoroSettings() async {
+    bool enabled = _controller.pomodoroEnabled;
+    int studyMinutes = _controller.studyMinutes;
+    int breakMinutes = _controller.breakMinutes;
+    final bool canEdit = _controller.isIdle;
+
+    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: [
+                  Row(
+                    children: [
+                      const Expanded(
+                        child: Text(
+                          '뽀모도로 모드',
+                          style: TextStyle(
+                            fontWeight: FontWeight.bold,
+                            fontSize: 16,
+                          ),
+                        ),
+                      ),
+                      Switch(
+                        value: enabled,
+                        activeThumbColor: AppPalette.ink,
+                        onChanged: canEdit
+                            ? (v) => setSheetState(() => enabled = v)
+                            : null,
+                      ),
+                    ],
+                  ),
+                  const Text(
+                    '공부/휴식 시간을 정해두면, 공부 시간이 끝났을 때 자동으로\n일시정지되고 휴식이 끝나면 자동으로 다시 시작해요.',
+                    style: TextStyle(color: Colors.grey, fontSize: 12.5),
+                  ),
+                  if (!canEdit) ...[
+                    const SizedBox(height: 10),
+                    const Text(
+                      '타이머가 멈춰있을 때만 설정을 바꿀 수 있어요.',
+                      style: TextStyle(color: Colors.redAccent, fontSize: 12.5),
+                    ),
+                  ],
+                  const SizedBox(height: 18),
+                  _minuteStepper(
+                    label: '공부 시간',
+                    minutes: studyMinutes,
+                    enabled: canEdit,
+                    onChanged: (v) => setSheetState(() => studyMinutes = v),
+                  ),
+                  const SizedBox(height: 12),
+                  _minuteStepper(
+                    label: '휴식 시간',
+                    minutes: breakMinutes,
+                    enabled: canEdit,
+                    onChanged: (v) => setSheetState(() => breakMinutes = v),
+                  ),
+                  const SizedBox(height: 18),
+                  ElevatedButton(
+                    style: ElevatedButton.styleFrom(
+                      backgroundColor: AppPalette.ink,
+                      foregroundColor: AppPalette.paper,
+                      padding: const EdgeInsets.symmetric(vertical: 14),
+                    ),
+                    onPressed: !canEdit
+                        ? null
+                        : () async {
+                            await _controller.setPomodoroSettings(
+                              enabled: enabled,
+                              studyMinutes: studyMinutes,
+                              breakMinutes: breakMinutes,
+                            );
+                            if (sheetContext.mounted) {
+                              Navigator.of(sheetContext).pop();
+                            }
+                          },
+                    child: const Text('저장'),
+                  ),
+                ],
+              ),
+            );
+          },
+        );
+      },
+    );
+  }
+
+  Widget _minuteStepper({
+    required String label,
+    required int minutes,
+    required bool enabled,
+    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: enabled && minutes > 5
+              ? () => onChanged(minutes - 5)
+              : null,
+        ),
+        SizedBox(
+          width: 48,
+          child: Text(
+            '$minutes분',
+            textAlign: TextAlign.center,
+            style: const TextStyle(fontWeight: FontWeight.bold),
+          ),
+        ),
+        IconButton(
+          icon: const Icon(Icons.add_circle_outline_rounded),
+          onPressed: enabled && minutes < 120
+              ? () => onChanged(minutes + 5)
+              : null,
+        ),
+      ],
+    );
+  }
+
   void _openRanking() {
     if (widget.grade == null) {
       AppNotice.show(context, '학년 정보가 없어 랭킹을 볼 수 없어요.');
@@ -102,6 +266,11 @@ class _StudyTimerScreenState extends State<StudyTimerScreen> {
             centerTitle: true,
             title: const TitlePill('백품타'),
             actions: [
+              IconButton(
+                icon: const Icon(Icons.tune_rounded),
+                tooltip: '뽀모도로 설정',
+                onPressed: _showPomodoroSettings,
+              ),
               IconButton(
                 icon: const Icon(Icons.leaderboard_rounded),
                 tooltip: '학년 랭킹',
@@ -118,16 +287,26 @@ class _StudyTimerScreenState extends State<StudyTimerScreen> {
                       mainAxisSize: MainAxisSize.min,
                       children: [
                         Text(
-                          isRunning
-                              ? '지금 공부 중이에요'
-                              : isPaused
-                              ? '일시정지 중이에요'
-                              : '공부를 시작해볼까요?',
+                          _statusLabel(isRunning, isPaused),
                           style: const TextStyle(
                             fontSize: 15,
                             color: Colors.grey,
                           ),
                         ),
+                        if (_controller.pomodoroEnabled &&
+                            _controller.phase != null) ...[
+                          const SizedBox(height: 4),
+                          Text(
+                            '${_controller.phase == PomodoroPhase.study ? '다음 휴식까지' : '다음 공부까지'} '
+                            '${_formatMinSec(_controller.phaseSecondsLeft)} · '
+                            '완료 ${_controller.completedCycles}회',
+                            style: const TextStyle(
+                              fontSize: 12.5,
+                              color: Colors.grey,
+                              fontWeight: FontWeight.w600,
+                            ),
+                          ),
+                        ],
                         const SizedBox(height: 12),
                         Text(
                           _formatHMS(_controller.liveElapsedSeconds),
@@ -173,11 +352,21 @@ class _StudyTimerScreenState extends State<StudyTimerScreen> {
       return _circleButton(
         size: 140,
         icon: Icons.play_arrow_rounded,
-        label: '공부 시작',
+        label: _controller.pomodoroEnabled ? '뽀모도로 시작' : '공부 시작',
         color: AppPalette.ink,
         onTap: () => _runAction(_controller.start),
       );
     }
+    if (_controller.pomodoroEnabled && _controller.phase != null) {
+      // 뽀모도로 자동 전환 중에는 일시정지/재개는 자동으로 일어나니 종료 버튼만 보여준다.
+      return _circleButton(
+        size: 140,
+        icon: Icons.stop_rounded,
+        label: '공부 종료',
+        color: Colors.red[400]!,
+        onTap: () => _runAction(_controller.stop),
+      );
+    }
     return Row(
       mainAxisAlignment: MainAxisAlignment.center,
       children: [