diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRepository.java b/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRepository.java
index 09985874..5c0ce450 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRepository.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRepository.java
@@ -13,19 +13,24 @@
 
 @Repository
 public interface AttendanceRepository extends JpaRepository<Attendance, UUID> {
-    boolean existsByUserAndAttendanceRound( User user, AttendanceRound round);
 
-    boolean existsByUser_UserIdAndAttendanceRound_RoundId(UUID userId, UUID roundId);
-    List<Attendance> findByAttendanceRound_RoundId(UUID roundId);
-    void deleteAllByAttendanceRound_AttendanceSession_AttendanceSessionIdAndUser_UserId(
-        UUID sessionId,
-        UUID userId
-    );
+  boolean existsByUserAndAttendanceRound(User user, AttendanceRound round);
 
-    // 사용자별 출석 이력
-    List<Attendance> findByUserOrderByCheckedAtDesc(User user);
+  boolean existsByUser_UserIdAndAttendanceRound_RoundId(UUID userId, UUID roundId);
 
-    // 라운드별 특정 사용자 출석 확인
-    @Query("SELECT a FROM Attendance a WHERE a.attendanceRound.roundId = :roundId AND a.user = :user")
-    Optional<Attendance> findByAttendanceRound_RoundIdAndUser(@Param("roundId") UUID roundId, @Param("user") User user);
+  List<Attendance> findByAttendanceRound_RoundId(UUID roundId);
+
+  void deleteAllByAttendanceRound_AttendanceSession_AttendanceSessionIdAndUser_UserId(
+      UUID sessionId,
+      UUID userId
+  );
+
+  // 사용자별 출석 이력
+  List<Attendance> findByUserOrderByCheckedAtDesc(User user);
+
+  // 라운드별 특정 사용자 출석 확인
+  @Query("SELECT a FROM Attendance a WHERE a.attendanceRound.roundId = :roundId AND a.user = :user")
+  Optional<Attendance> findByAttendanceRound_RoundIdAndUser(@Param("roundId") UUID roundId, @Param("user") User user);
+
+  List<Attendance> findAllByAttendanceRound(AttendanceRound round);
 }
diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRoundRepository.java b/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRoundRepository.java
index c2af36b7..4ae9d0c7 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRoundRepository.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/repository/AttendanceRoundRepository.java
@@ -1,25 +1,23 @@
 package org.sejongisc.backend.attendance.repository;
 
+import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
 import org.sejongisc.backend.attendance.entity.AttendanceRound;
+import org.sejongisc.backend.attendance.entity.RoundStatus;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
 
-import java.time.LocalDate;
-import java.util.List;
-import java.util.Optional;
-import java.util.UUID;
-
 @Repository
 public interface AttendanceRoundRepository extends JpaRepository<AttendanceRound, UUID> {
 
     List<AttendanceRound> findByAttendanceSession_AttendanceSessionIdAndRoundDateBefore(UUID sessionId, LocalDate date);
 
-
-
     // UPCOMING -> ACTIVE
     @Modifying(clearAutomatically = true, flushAutomatically = true)
     @Query("""
@@ -40,8 +38,7 @@ public interface AttendanceRoundRepository extends JpaRepository<AttendanceRound
 """)
     int closeDueRounds(LocalDateTime now);
 
-
-
+  List<AttendanceRound> findByRoundStatusAndCloseAtBefore(RoundStatus status, LocalDateTime dateTime);
 
     Optional<AttendanceRound> findByQrSecret(String qrCode);
     List<AttendanceRound> findByAttendanceSession_AttendanceSessionId(UUID sessionId);
diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java b/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java
index 35bf359b..27a53263 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java
@@ -2,17 +2,24 @@
 
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.Set;
 import java.util.UUID;
+import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.sejongisc.backend.attendance.dto.AttendanceRoundQrTokenResponse;
 import org.sejongisc.backend.attendance.dto.AttendanceRoundRequest;
 import org.sejongisc.backend.attendance.dto.AttendanceRoundResponse;
+import org.sejongisc.backend.attendance.entity.Attendance;
 import org.sejongisc.backend.attendance.entity.AttendanceRound;
 import org.sejongisc.backend.attendance.entity.AttendanceSession;
+import org.sejongisc.backend.attendance.entity.AttendanceStatus;
 import org.sejongisc.backend.attendance.entity.RoundStatus;
+import org.sejongisc.backend.attendance.entity.SessionUser;
+import org.sejongisc.backend.attendance.repository.AttendanceRepository;
 import org.sejongisc.backend.attendance.repository.AttendanceRoundRepository;
 import org.sejongisc.backend.attendance.repository.AttendanceSessionRepository;
+import org.sejongisc.backend.attendance.repository.SessionUserRepository;
 import org.sejongisc.backend.attendance.util.QrTokenUtil;
 import org.sejongisc.backend.attendance.util.RollingQrTokenUtil;
 import org.sejongisc.backend.common.exception.CustomException;
@@ -31,6 +38,8 @@ public class AttendanceRoundService {
 
   private final AttendanceRoundRepository attendanceRoundRepository;
   private final AttendanceSessionRepository attendanceSessionRepository;
+  private final AttendanceRepository attendanceRepository;
+  private final SessionUserRepository sessionUserRepository;
   private final AttendanceAuthorizationService authorizationService;
   private final QrTokenStreamService qrTokenStreamService;
 
@@ -193,11 +202,22 @@ public void openRound(UUID roundId, UUID userId) {
   @Transactional(propagation = Propagation.REQUIRES_NEW)
   public void runRoundStatusMaintenance() {
     LocalDateTime now = LocalDateTime.now();
-    int closed = attendanceRoundRepository.closeDueRounds(now);
+
+    List<AttendanceRound> roundsToClose = attendanceRoundRepository
+        .findByRoundStatusAndCloseAtBefore(RoundStatus.ACTIVE, now);
+
+    for (AttendanceRound round : roundsToClose) {
+      // 상태를 CLOSED로 변경
+      round.changeStatus(RoundStatus.CLOSED);
+
+      // 결석 처리 로직 실행
+      processAbsentees(round);
+    }
+
     int activated = attendanceRoundRepository.activateDueRounds(now);
 
-    if (activated > 0 || closed > 0) {
-      log.info("[Quartz] activated={}, closed={}", activated, closed);
+    if (activated > 0 || !roundsToClose.isEmpty()) {
+      log.info("[Quartz] activated={}, closed={}", activated, roundsToClose.size());
     }
   }
 
@@ -209,4 +229,38 @@ private void validateCreateRequest(AttendanceRoundRequest req) {
       throw new CustomException(ErrorCode.END_AT_MUST_BE_AFTER_START_AT);
     }
   }
+
+  /**
+   * 결석자 일괄 처리
+   * **/
+  private void processAbsentees(AttendanceRound round) {
+    UUID sessionId = round.getAttendanceSession().getAttendanceSessionId();
+
+    // 해당 세션에 등록된 모든 유저 목록 조회
+    List<SessionUser> allSessionUsers = sessionUserRepository.findByAttendanceSession_AttendanceSessionId(sessionId);
+
+    // 현재 라운드에 이미 출석 기록(PRESENT, LATE 등)이 있는 SessionUser의 ID 추출
+    Set<UUID> attendedUserIds = attendanceRepository.findAllByAttendanceRound(round)
+        .stream()
+        .map(a -> a.getUser().getUserId())
+        .collect(Collectors.toSet());
+
+    // 출석 기록이 없는 SessionUser만 필터링하여 'ABSENT' 레코드 생성
+    List<Attendance> absentRecords = allSessionUsers.stream()
+        .map(SessionUser::getUser)
+        .filter(user -> !attendedUserIds.contains(user.getUserId()))
+        .map(user -> Attendance.builder()
+            .attendanceRound(round)
+            .user(user)
+            .attendanceStatus(AttendanceStatus.ABSENT)
+            .note("시스템 자동 결석 처리")
+            .build())
+        .toList();
+
+    // 결석 데이터 일괄 저장
+    if (!absentRecords.isEmpty()) {
+      attendanceRepository.saveAll(absentRecords);
+      log.debug("[Round-{}] {}명의 SessionUser 결석 처리 완료", round.getRoundId(), absentRecords.size());
+    }
+  }
 }