diff --git a/src/main/java/org/harang/server/controller/PostController.java b/src/main/java/org/harang/server/controller/PostController.java
index 0c021d2..e56b698 100644
--- a/src/main/java/org/harang/server/controller/PostController.java
+++ b/src/main/java/org/harang/server/controller/PostController.java
@@ -30,6 +30,12 @@ public ApiResponse<?> createPost(@MemberId Long memberId, @Valid @RequestBody Po
         return ApiResponse.success(SuccessMessage.CREATED);
     }
 
+    @DeleteMapping("/{postId}")
+    public ApiResponse<?> deletePost(@MemberId Long memberId, @PathVariable Long postId) {
+        postService.deletePost(memberId, postId);
+        return ApiResponse.success(SuccessMessage.OK);
+    }
+
     @GetMapping
     public ApiResponse<List<PostResponse>> getAllPosts() {
         return ApiResponse.success(postService.getAllPosts());
diff --git a/src/main/java/org/harang/server/domain/Category.java b/src/main/java/org/harang/server/domain/Category.java
index f3f79d3..36d6854 100644
--- a/src/main/java/org/harang/server/domain/Category.java
+++ b/src/main/java/org/harang/server/domain/Category.java
@@ -21,7 +21,7 @@ public class Category {
     @Column(name = "name", nullable = false)
     private String name;
 
-    @OneToMany(mappedBy = "category")
+    @OneToMany(mappedBy = "category", cascade = CascadeType.ALL)
     private List<PostCategory> postCategoryList = new ArrayList<>();
 
     @Builder
diff --git a/src/main/java/org/harang/server/domain/Help.java b/src/main/java/org/harang/server/domain/Help.java
index 07dd418..9a0f2e1 100644
--- a/src/main/java/org/harang/server/domain/Help.java
+++ b/src/main/java/org/harang/server/domain/Help.java
@@ -22,7 +22,7 @@ public class Help {
     private String name;
 
     /* Relation Parent Mapping */
-    @OneToMany(mappedBy = "help")
+    @OneToMany(mappedBy = "help", cascade = CascadeType.ALL)
     private List<MemberHelp> memberHelpList = new ArrayList<>();
 
     @Builder
diff --git a/src/main/java/org/harang/server/domain/Location.java b/src/main/java/org/harang/server/domain/Location.java
index ad08ce8..f54751c 100644
--- a/src/main/java/org/harang/server/domain/Location.java
+++ b/src/main/java/org/harang/server/domain/Location.java
@@ -15,7 +15,7 @@ public class Location {
     @Column(name = "id", nullable = false)
     private Long id;
 
-    @OneToOne(fetch = FetchType.LAZY)
+    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
     @JoinColumn(name = "post_id")
     private Post post;
 
diff --git a/src/main/java/org/harang/server/domain/MemberInfo.java b/src/main/java/org/harang/server/domain/MemberInfo.java
index 4dc4339..94509e3 100644
--- a/src/main/java/org/harang/server/domain/MemberInfo.java
+++ b/src/main/java/org/harang/server/domain/MemberInfo.java
@@ -32,10 +32,10 @@ public class MemberInfo {
     private String refreshToken;
 
     /* Relation Parent Mapping */
-    @OneToMany(mappedBy = "memberInfo")
+    @OneToMany(mappedBy = "memberInfo", cascade = CascadeType.ALL)
     private List<MemberHelp> memberHelpList = new ArrayList<>();
 
-    @OneToMany(mappedBy = "memberInfo")
+    @OneToMany(mappedBy = "memberInfo", cascade = CascadeType.ALL)
     private List<Certification> certificationList = new ArrayList<>();
 
     @Builder
diff --git a/src/main/java/org/harang/server/domain/Post.java b/src/main/java/org/harang/server/domain/Post.java
index 381f609..1ed35ef 100644
--- a/src/main/java/org/harang/server/domain/Post.java
+++ b/src/main/java/org/harang/server/domain/Post.java
@@ -55,13 +55,13 @@ public class Post {
     private Status status = Status.WAITING;
 
     /* Relation Parent Mapping */
-    @OneToMany(mappedBy = "post")
+    @OneToMany(mappedBy = "post", cascade = CascadeType.ALL)
     private List<Matching> matchingList = new ArrayList<>();
 
-    @OneToMany(mappedBy = "post")
+    @OneToMany(mappedBy = "post", cascade = CascadeType.ALL)
     private List<PostCategory> postCategoryList = new ArrayList<>();
 
-    @OneToMany(mappedBy = "post")
+    @OneToMany(mappedBy = "post", cascade = CascadeType.ALL)
     private List<Waiting> waitingList = new ArrayList<>();
 
     @Builder
diff --git a/src/main/java/org/harang/server/repository/LocationRepository.java b/src/main/java/org/harang/server/repository/LocationRepository.java
index 05ce167..a950b26 100644
--- a/src/main/java/org/harang/server/repository/LocationRepository.java
+++ b/src/main/java/org/harang/server/repository/LocationRepository.java
@@ -1,7 +1,16 @@
 package org.harang.server.repository;
 
+import jakarta.transaction.Transactional;
 import org.harang.server.domain.Location;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
 
 public interface LocationRepository extends JpaRepository<Location, Long> {
-}
+    Location findByPostId(Long PostId);
+
+    @Transactional
+    @Modifying
+    @Query("DELETE FROM Location l WHERE l.post.id = :postId")
+    void deleteByPostId(Long postId);
+}
\ No newline at end of file
diff --git a/src/main/java/org/harang/server/service/PostService.java b/src/main/java/org/harang/server/service/PostService.java
index 46e0900..f6b1436 100644
--- a/src/main/java/org/harang/server/service/PostService.java
+++ b/src/main/java/org/harang/server/service/PostService.java
@@ -77,4 +77,11 @@ public List<PostResponse> getAllPosts() {
                 .collect(Collectors.toList());
     }
 
+    @Transactional
+    public void deletePost(Long memberId, Long postId) {
+        Post post = postRepository.findByIdOrThrow(postId);
+
+        locationRepository.deleteByPostId(postId);
+        postRepository.delete(post);
+    }
 }