diff --git a/src/main/java/org/tuna/zoopzoop/backend/domain/member/controller/ApiV1MemberController.java b/src/main/java/org/tuna/zoopzoop/backend/domain/member/controller/ApiV1MemberController.java
index b5a03287..8588951a 100644
--- a/src/main/java/org/tuna/zoopzoop/backend/domain/member/controller/ApiV1MemberController.java
+++ b/src/main/java/org/tuna/zoopzoop/backend/domain/member/controller/ApiV1MemberController.java
@@ -15,6 +15,9 @@
 import org.tuna.zoopzoop.backend.domain.member.dto.res.*;
 import org.tuna.zoopzoop.backend.domain.member.entity.Member;
 import org.tuna.zoopzoop.backend.domain.member.service.MemberService;
+import org.tuna.zoopzoop.backend.domain.space.membership.service.MembershipService;
+import org.tuna.zoopzoop.backend.domain.space.space.entity.Space;
+import org.tuna.zoopzoop.backend.domain.space.space.service.SpaceService;
 import org.tuna.zoopzoop.backend.global.rsData.RsData;
 import org.tuna.zoopzoop.backend.global.security.jwt.CustomUserDetails;
 
@@ -27,6 +30,8 @@
 public class ApiV1MemberController {
     private final MemberService memberService;
     private final RefreshTokenService refreshTokenService;
+    private final MembershipService membershipService;
+    private final SpaceService spaceService;
     /// api/v1/member/me : 사용자 정보 조회 (GET)
     /// api/v1/member/edit : 사용자 닉네임 수정 (PUT)
     /// api/v1/member : 사용자 탈퇴 (DELETE)
@@ -147,6 +152,13 @@ public ResponseEntity<RsData<Void>> deleteMember(
             @AuthenticationPrincipal CustomUserDetails userDetails
     ) {
         Member member = userDetails.getMember();
+
+        // 사용자가 유일한 어드민인 모든 스페이스 삭제
+        List<Space> deletableSpaces = membershipService.findByOnlyAdmin(member);
+        for (Space space : deletableSpaces) {
+            spaceService.deleteSpace(space.getId());
+        }
+
         refreshTokenService.deleteByMember(member);
         memberService.hardDeleteMember(member);
         return ResponseEntity
diff --git a/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/repository/MembershipRepository.java b/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/repository/MembershipRepository.java
index b92d8999..26ec89f1 100644
--- a/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/repository/MembershipRepository.java
+++ b/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/repository/MembershipRepository.java
@@ -59,4 +59,5 @@ public interface MembershipRepository extends JpaRepository<Membership, Integer>
     // 여러 Space에 속한 Member 목록 한번에 조회 (JOIN FETCH로 Member 정보까지)
     @Query("SELECT m FROM Membership m JOIN FETCH m.member WHERE m.space IN :spaces AND m.authority <> org.tuna.zoopzoop.backend.domain.space.membership.enums.Authority.PENDING")
     List<Membership> findAllMembersInSpaces(@Param("spaces") List<Space> spaces);
+
 }
diff --git a/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/service/MembershipService.java b/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/service/MembershipService.java
index 733979ee..51d4366b 100644
--- a/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/service/MembershipService.java
+++ b/src/main/java/org/tuna/zoopzoop/backend/domain/space/membership/service/MembershipService.java
@@ -93,6 +93,33 @@ public List<Membership> findByMember(Member member, String state) {
         }
     }
 
+    /**
+     * 멤버가 ADMIN 권한을 가진 스페이스 목록 조회
+     * @param member 조회할 멤버
+     * @return 멤버가 유일한 ADMIN 권한을 가진 스페이스 목록
+     */
+    public List<Space> findByAdmin(Member member) {
+        return membershipRepository.findAllByMemberAndAuthorityOrderById(member, Authority.ADMIN)
+                .stream()
+                .map(Membership::getSpace)
+                .collect(Collectors.toList());
+    }
+
+    /**
+     * 멤버가 유일한 ADMIN 권한을 가진 스페이스 목록 조회
+     * @param member 조회할 멤버
+     * @return 멤버가 유일한 ADMIN 권한을 가진 스페이스 목록
+     */
+    public List<Space> findByOnlyAdmin(Member member) {
+        // 1. 멤버가 ADMIN 권한을 가진 모든 스페이스 조회
+        List<Space> adminSpaces = findByAdmin(member);
+
+        // 2. 각 스페이스에서 ADMIN 멤버 수가 1명인 스페이스만 필터링
+        return adminSpaces.stream()
+                .filter(space -> membershipRepository.countBySpaceAndAuthority(space, Authority.ADMIN) == 1)
+                .collect(Collectors.toList());
+    }
+
     /**
      * 스페이스에 속한 멤버 중 초대 상태(PENDING)인 멤버십 목록 조회
      * @param space 조회할 스페이스