diff --git a/ClientTester/EchoClientTester/Packet/PacketBody.cs b/ClientTester/EchoClientTester/Packet/PacketBody.cs
index 4c133df..ecae837 100644
--- a/ClientTester/EchoClientTester/Packet/PacketBody.cs
+++ b/ClientTester/EchoClientTester/Packet/PacketBody.cs
@@ -540,7 +540,7 @@ public class RequestPartyPacket
     }
 
     [ProtoMember(2)]
-    public long PartyId
+    public int PartyId
     {
         get;
         set;
@@ -559,7 +559,7 @@ public class RequestPartyPacket
 public class UpdatePartyPacket
 {
     [ProtoMember(1)]
-    public long PartyId
+    public int PartyId
     {
         get;
         set;
diff --git a/MMOTestServer/MMOserver/Game/GameServer.cs b/MMOTestServer/MMOserver/Game/GameServer.cs
index bd30085..95b769b 100644
--- a/MMOTestServer/MMOserver/Game/GameServer.cs
+++ b/MMOTestServer/MMOserver/Game/GameServer.cs
@@ -2,6 +2,7 @@ using LiteNetLib;
 using LiteNetLib.Utils;
 using MMOserver.Api;
 using MMOserver.Game.Channel;
+using MMOserver.Game.Party;
 using MMOserver.Packet;
 using MMOserver.Utils;
 using ProtoBuf;
@@ -25,6 +26,7 @@ public class GameServer : ServerBase
             [(ushort)PacketCode.TRANSFORM_PLAYER] = OnTransformPlayer,
             [(ushort)PacketCode.ACTION_PLAYER] = OnActionPlayer,
             [(ushort)PacketCode.STATE_PLAYER] = OnStatePlayer,
+            [(ushort)PacketCode.REQUEST_PARTY] = OnRequestParty,
         };
         userUuidGenerator = new UuidGenerator();
     }
@@ -462,4 +464,99 @@ public class GameServer : ServerBase
         byte[] data = PacketSerializer.Serialize<StatePlayerPacket>((ushort)PacketCode.STATE_PLAYER, packet);
         BroadcastToChannel(channelId, data, peer);
     }
+
+    private void OnRequestParty(NetPeer peer, int hashKey, byte[] payload)
+    {
+        RequestPartyPacket req = Serializer.Deserialize<RequestPartyPacket>(new ReadOnlyMemory<byte>(payload));
+        PartyManager pm = PartyManager.Instance;
+
+        switch (req.Type)
+        {
+            case PartyUpdateType.CREATE:
+            {
+                if (!pm.CreateParty(hashKey, req.PartyName, out PartyInfo? party))
+                {
+                    return;
+                }
+
+                UpdatePartyPacket notify = new UpdatePartyPacket
+                {
+                    PartyId = party!.PartyId,
+                    Type = PartyUpdateType.CREATE,
+                    LeaderId = party.LeaderId,
+                    PlayerId = hashKey,
+                    PartyName = party.PartyName,
+                };
+                byte[] data = PacketSerializer.Serialize<UpdatePartyPacket>((ushort)PacketCode.UPDATE_PARTY, notify);
+                SendTo(peer, data);
+                break;
+            }
+            case PartyUpdateType.JOIN:
+            {
+                if (!pm.JoinParty(hashKey, req.PartyId, out PartyInfo? party))
+                {
+                    return;
+                }
+
+                UpdatePartyPacket notify = new UpdatePartyPacket
+                {
+                    PartyId = party!.PartyId,
+                    Type = PartyUpdateType.JOIN,
+                    LeaderId = party.LeaderId,
+                    PlayerId = hashKey,
+                };
+                byte[] data = PacketSerializer.Serialize<UpdatePartyPacket>((ushort)PacketCode.UPDATE_PARTY, notify);
+                BroadcastToUsers(party.PartyMemberIds, data); // 새 멤버 포함 전원
+                break;
+            }
+            case PartyUpdateType.LEAVE:
+            {
+                if (!pm.LeaveParty(hashKey, out PartyInfo? party))
+                {
+                    return;
+                }
+
+                UpdatePartyPacket notify = new UpdatePartyPacket
+                {
+                    PartyId = req.PartyId,
+                    Type = PartyUpdateType.LEAVE,
+                    LeaderId = party?.LeaderId ?? 0,
+                    PlayerId = hashKey,
+                };
+                byte[] data = PacketSerializer.Serialize<UpdatePartyPacket>((ushort)PacketCode.UPDATE_PARTY, notify);
+                if (party != null)
+                    BroadcastToUsers(party.PartyMemberIds, data); // 남은 멤버들에게
+                SendTo(peer, data); // 탈퇴자 본인에게
+                break;
+            }
+            case PartyUpdateType.DELETE:
+            {
+                if (!pm.DeleteParty(hashKey, req.PartyId, out PartyInfo? party))
+                {
+                    return;
+                }
+
+                UpdatePartyPacket notify = new UpdatePartyPacket
+                {
+                    PartyId = party!.PartyId,
+                    Type = PartyUpdateType.DELETE,
+                    LeaderId = party.LeaderId,
+                };
+                byte[] data = PacketSerializer.Serialize<UpdatePartyPacket>((ushort)PacketCode.UPDATE_PARTY, notify);
+                BroadcastToUsers(party.PartyMemberIds, data); // 전원 (리더 포함)
+                break;
+            }
+        }
+    }
+
+    private void BroadcastToUsers(IEnumerable<int> userIds, byte[] data, DeliveryMethod method = DeliveryMethod.ReliableOrdered)
+    {
+        foreach (int userId in userIds)
+        {
+            if (sessions.TryGetValue(userId, out NetPeer? targetPeer))
+            {
+                SendTo(targetPeer, data, method);
+            }
+        }
+    }
 }
diff --git a/MMOTestServer/MMOserver/Game/Party/Party.cs b/MMOTestServer/MMOserver/Game/Party/Party.cs
new file mode 100644
index 0000000..8c96a15
--- /dev/null
+++ b/MMOTestServer/MMOserver/Game/Party/Party.cs
@@ -0,0 +1,35 @@
+namespace MMOserver.Game.Party;
+
+public class PartyInfo
+{
+    public static readonly int partyMemberMax = 3;
+
+    public int PartyId
+    {
+        get;
+        set;
+    }
+
+    public int LeaderId
+    {
+        get;
+        set;
+    }
+
+    public List<int> PartyMemberIds
+    {
+        get;
+        set;
+    } = new List<int>();
+
+    public string PartyName
+    {
+        get;
+        set;
+    } = "";
+
+    public int GetPartyMemberCount()
+    {
+        return PartyMemberIds.Count;
+    }
+}
diff --git a/MMOTestServer/MMOserver/Game/Party/PartyManager.cs b/MMOTestServer/MMOserver/Game/Party/PartyManager.cs
new file mode 100644
index 0000000..41f5b7e
--- /dev/null
+++ b/MMOTestServer/MMOserver/Game/Party/PartyManager.cs
@@ -0,0 +1,152 @@
+using MMOserver.Utils;
+
+namespace MMOserver.Game.Party;
+
+public class PartyManager : Singleton<PartyManager>
+{
+    private readonly UuidGenerator partyUuidGenerator = new UuidGenerator();
+
+    // partyId → PartyInfo
+    private readonly Dictionary<int, PartyInfo> parties = new();
+
+    // playerId → partyId (한 플레이어는 하나의 파티만)
+    private readonly Dictionary<int, int> playerPartyMap = new();
+
+    // 파티 생성
+    public bool CreateParty(int leaderId, string partyName, out PartyInfo? party)
+    {
+        party = null;
+
+        if (playerPartyMap.ContainsKey(leaderId))
+        {
+            return false; // 이미 파티에 속해있음
+        }
+
+        int partyId = partyUuidGenerator.Create();
+        party = new PartyInfo
+        {
+            PartyId = partyId,
+            LeaderId = leaderId,
+            PartyName = partyName,
+        };
+        party.PartyMemberIds.Add(leaderId);
+
+        parties[partyId] = party;
+        playerPartyMap[leaderId] = partyId;
+
+        return true;
+    }
+
+    // 파티 참가
+    public bool JoinParty(int playerId, int partyId, out PartyInfo? party)
+    {
+        party = null;
+
+        if (playerPartyMap.ContainsKey(playerId))
+        {
+            return false; // 이미 파티에 속해있음
+        }
+
+        if (!parties.TryGetValue(partyId, out party))
+        {
+            return false; // 파티 없음
+        }
+
+        if (party.GetPartyMemberCount() >= PartyInfo.partyMemberMax)
+        {
+            party = null;
+            return false; // 파티 인원 초과
+        }
+
+        party.PartyMemberIds.Add(playerId);
+        playerPartyMap[playerId] = partyId;
+
+        return true;
+    }
+
+    // 파티 탈퇴
+    public bool LeaveParty(int playerId, out PartyInfo? party)
+    {
+        party = null;
+
+        if (!playerPartyMap.TryGetValue(playerId, out int partyId))
+        {
+            return false; // 파티에 속해있지 않음
+        }
+
+        if (!parties.TryGetValue(partyId, out party))
+        {
+            return false;
+        }
+
+        party.PartyMemberIds.Remove(playerId);
+        playerPartyMap.Remove(playerId);
+
+        // 마지막 멤버가 나가면 파티 해산
+        if (party.PartyMemberIds.Count == 0)
+        {
+            DeletePartyInternal(partyId, party);
+            party = null;
+            return true;
+        }
+
+        // 리더가 나갔으면 남은 멤버 중 첫 번째를 리더로 승계
+        if (party.LeaderId == playerId)
+        {
+            party.LeaderId = party.PartyMemberIds[0];
+        }
+
+        return true;
+    }
+
+    // 파티 해산 (리더만)
+    public bool DeleteParty(int leaderId, int partyId, out PartyInfo? party)
+    {
+        party = null;
+
+        if (!parties.TryGetValue(partyId, out party))
+        {
+            return false;
+        }
+
+        if (party.LeaderId != leaderId)
+        {
+            party = null;
+            return false; // 리더만 해산 가능
+        }
+
+        DeletePartyInternal(partyId, party);
+        return true;
+    }
+
+    // 조회
+    public PartyInfo? GetParty(int partyId)
+    {
+        parties.TryGetValue(partyId, out PartyInfo? party);
+        return party;
+    }
+
+    public PartyInfo? GetPartyByPlayer(int playerId)
+    {
+        if (!playerPartyMap.TryGetValue(playerId, out int partyId))
+        {
+            return null;
+        }
+
+        parties.TryGetValue(partyId, out PartyInfo? party);
+        return party;
+    }
+
+    // 삭제
+    private void DeletePartyInternal(int partyId, PartyInfo party)
+    {
+        // 남아 있는인원도 제거
+        foreach (int memberId in party.PartyMemberIds)
+        {
+            playerPartyMap.Remove(memberId);
+        }
+
+        parties.Remove(partyId);
+        partyUuidGenerator.Release(partyId);
+    }
+}
diff --git a/MMOTestServer/MMOserver/Packet/PacketBody.cs b/MMOTestServer/MMOserver/Packet/PacketBody.cs
index 17bf30e..ee3a61d 100644
--- a/MMOTestServer/MMOserver/Packet/PacketBody.cs
+++ b/MMOTestServer/MMOserver/Packet/PacketBody.cs
@@ -540,7 +540,7 @@ public class RequestPartyPacket
     }
 
     [ProtoMember(2)]
-    public long PartyId
+    public int PartyId
     {
         get;
         set;
@@ -559,7 +559,7 @@ public class RequestPartyPacket
 public class UpdatePartyPacket
 {
     [ProtoMember(1)]
-    public long PartyId
+    public int PartyId
     {
         get;
         set;