diff --git a/frontend/src/pages/mobile/public/ScheduleDetail.jsx b/frontend/src/pages/mobile/public/ScheduleDetail.jsx
index ffe0507..8abea95 100644
--- a/frontend/src/pages/mobile/public/ScheduleDetail.jsx
+++ b/frontend/src/pages/mobile/public/ScheduleDetail.jsx
@@ -2,7 +2,7 @@ import { useParams, Link } from 'react-router-dom';
 import { useQuery, keepPreviousData } from '@tanstack/react-query';
 import { useEffect, useState, useRef } from 'react';
 import { motion, AnimatePresence } from 'framer-motion';
-import { Calendar, Clock, ChevronLeft, Check, Link2, MapPin, Navigation, ExternalLink } from 'lucide-react';
+import { Calendar, Clock, ChevronLeft, Check, Link2, MapPin, Navigation, ExternalLink, X, ChevronRight } from 'lucide-react';
 import Linkify from 'react-linkify';
 import { getSchedule } from '../../../api/public/schedules';
 import '../../../mobile.css';
@@ -308,6 +308,39 @@ function XSection({ schedule }) {
     const displayName = profile?.displayName || username;
     const avatarUrl = profile?.avatarUrl;
 
+    // 라이트박스 상태
+    const [lightboxOpen, setLightboxOpen] = useState(false);
+    const [lightboxIndex, setLightboxIndex] = useState(0);
+
+    const openLightbox = (index) => {
+        setLightboxIndex(index);
+        setLightboxOpen(true);
+    };
+
+    const goToPrev = () => {
+        if (schedule.imageUrls?.length > 1) {
+            setLightboxIndex((lightboxIndex - 1 + schedule.imageUrls.length) % schedule.imageUrls.length);
+        }
+    };
+
+    const goToNext = () => {
+        if (schedule.imageUrls?.length > 1) {
+            setLightboxIndex((lightboxIndex + 1) % schedule.imageUrls.length);
+        }
+    };
+
+    // 라이트박스 열릴 때 body 스크롤 방지
+    useEffect(() => {
+        if (lightboxOpen) {
+            document.body.style.overflow = 'hidden';
+        } else {
+            document.body.style.overflow = '';
+        }
+        return () => {
+            document.body.style.overflow = '';
+        };
+    }, [lightboxOpen]);
+
     // 링크 데코레이터 (새 탭에서 열기)
     const linkDecorator = (href, text, key) => (
         <a
@@ -337,6 +370,7 @@ function XSection({ schedule }) {
     };
 
     return (
+        <>
         <motion.div
             initial={{ opacity: 0, y: 10 }}
             animate={{ opacity: 1, y: 0 }}
@@ -390,7 +424,8 @@ function XSection({ schedule }) {
                         <img
                             src={schedule.imageUrls[0]}
                             alt=""
-                            className="w-full rounded-xl border border-gray-100"
+                            className="w-full rounded-xl border border-gray-100 cursor-pointer active:opacity-80 transition-opacity"
+                            onClick={() => openLightbox(0)}
                         />
                     ) : (
                         <div className={`grid gap-1 rounded-xl overflow-hidden border border-gray-100 ${
@@ -401,9 +436,10 @@ function XSection({ schedule }) {
                                     key={i}
                                     src={url}
                                     alt=""
-                                    className={`w-full object-cover ${
+                                    className={`w-full object-cover cursor-pointer active:opacity-80 transition-opacity ${
                                         schedule.imageUrls.length === 3 && i === 0 ? 'row-span-2 h-full' : 'aspect-square'
                                     }`}
+                                    onClick={() => openLightbox(i)}
                                 />
                             ))}
                         </div>
@@ -433,6 +469,72 @@ function XSection({ schedule }) {
                 </a>
             </div>
         </motion.div>
+
+        {/* 모바일 라이트박스 */}
+            <AnimatePresence>
+                {lightboxOpen && schedule.imageUrls?.length > 0 && (
+                    <motion.div
+                        initial={{ opacity: 0 }}
+                        animate={{ opacity: 1 }}
+                        exit={{ opacity: 0 }}
+                        className="fixed inset-0 bg-black z-50 flex items-center justify-center"
+                        onClick={() => setLightboxOpen(false)}
+                    >
+                        {/* 닫기 버튼 */}
+                        <button
+                            className="absolute top-4 right-4 p-2 text-white/70 z-10"
+                            onClick={() => setLightboxOpen(false)}
+                        >
+                            <X size={28} />
+                        </button>
+
+                        {/* 이미지 */}
+                        <motion.img
+                            key={lightboxIndex}
+                            src={schedule.imageUrls[lightboxIndex]}
+                            alt=""
+                            className="max-w-full max-h-full object-contain"
+                            initial={{ opacity: 0, scale: 0.95 }}
+                            animate={{ opacity: 1, scale: 1 }}
+                            onClick={(e) => e.stopPropagation()}
+                        />
+
+                        {/* 이전/다음 버튼 */}
+                        {schedule.imageUrls.length > 1 && (
+                            <>
+                                <button
+                                    className="absolute left-2 top-1/2 -translate-y-1/2 p-2 text-white/70"
+                                    onClick={(e) => { e.stopPropagation(); goToPrev(); }}
+                                >
+                                    <ChevronLeft size={32} />
+                                </button>
+                                <button
+                                    className="absolute right-2 top-1/2 -translate-y-1/2 p-2 text-white/70"
+                                    onClick={(e) => { e.stopPropagation(); goToNext(); }}
+                                >
+                                    <ChevronRight size={32} />
+                                </button>
+                            </>
+                        )}
+
+                        {/* 인디케이터 */}
+                        {schedule.imageUrls.length > 1 && (
+                            <div className="absolute bottom-6 left-1/2 -translate-x-1/2 flex gap-2">
+                                {schedule.imageUrls.map((_, i) => (
+                                    <button
+                                        key={i}
+                                        className={`w-2 h-2 rounded-full transition-colors ${
+                                            i === lightboxIndex ? 'bg-white' : 'bg-white/40'
+                                        }`}
+                                        onClick={(e) => { e.stopPropagation(); setLightboxIndex(i); }}
+                                    />
+                                ))}
+                            </div>
+                        )}
+                    </motion.div>
+                )}
+            </AnimatePresence>
+        </>
     );
 }
 
diff --git a/frontend/src/pages/pc/public/schedule-sections/XSection.jsx b/frontend/src/pages/pc/public/schedule-sections/XSection.jsx
index 6d3fe33..498dad1 100644
--- a/frontend/src/pages/pc/public/schedule-sections/XSection.jsx
+++ b/frontend/src/pages/pc/public/schedule-sections/XSection.jsx
@@ -1,6 +1,8 @@
+import { useState } from 'react';
 import { motion } from 'framer-motion';
 import Linkify from 'react-linkify';
 import { decodeHtmlEntities } from './utils';
+import Lightbox from '../../../../components/common/Lightbox';
 
 // datetime 포맷팅 (2026-01-18 19:00 → 오후 7:00 · 2026년 1월 18일)
 const formatXDateTime = (datetime) => {
@@ -27,6 +29,15 @@ function XSection({ schedule }) {
     const displayName = profile?.displayName || username;
     const avatarUrl = profile?.avatarUrl;
 
+    // 라이트박스 상태
+    const [lightboxOpen, setLightboxOpen] = useState(false);
+    const [lightboxIndex, setLightboxIndex] = useState(0);
+
+    const openLightbox = (index) => {
+        setLightboxIndex(index);
+        setLightboxOpen(true);
+    };
+
     // 링크 데코레이터 (새 탭에서 열기)
     const linkDecorator = (href, text, key) => (
         <a
@@ -96,7 +107,8 @@ function XSection({ schedule }) {
                             <img
                                 src={schedule.imageUrls[0]}
                                 alt=""
-                                className="w-full rounded-2xl border border-gray-100"
+                                className="w-full rounded-2xl border border-gray-100 cursor-pointer hover:opacity-90 transition-opacity"
+                                onClick={() => openLightbox(0)}
                             />
                         ) : (
                             <div className={`grid gap-1 rounded-2xl overflow-hidden border border-gray-100 ${
@@ -109,9 +121,10 @@ function XSection({ schedule }) {
                                         key={i}
                                         src={url}
                                         alt=""
-                                        className={`w-full object-cover ${
+                                        className={`w-full object-cover cursor-pointer hover:opacity-90 transition-opacity ${
                                             schedule.imageUrls.length === 3 && i === 0 ? 'row-span-2 h-full' : 'aspect-square'
                                         }`}
+                                        onClick={() => openLightbox(i)}
                                     />
                                 ))}
                             </div>
@@ -141,6 +154,15 @@ function XSection({ schedule }) {
                     </a>
                 </div>
             </motion.div>
+
+            {/* 라이트박스 */}
+            <Lightbox
+                images={schedule.imageUrls || []}
+                currentIndex={lightboxIndex}
+                isOpen={lightboxOpen}
+                onClose={() => setLightboxOpen(false)}
+                onIndexChange={setLightboxIndex}
+            />
         </div>
     );
 }