diff --git a/Projects/Domain/README.md b/Projects/Domain/README.md
index 2123bb9..47d95f2 100644
--- a/Projects/Domain/README.md
+++ b/Projects/Domain/README.md
@@ -5,6 +5,7 @@
 
 ## 현재 상태
 - Auth 포트 추가 (`AuthSession`, `AuthError`, `AuthProvider`, `AuthClient`)
+- User 포트 추가 (`UserProfile`, `OnboardingDraft`, `Gender`, `Interest`, `UserError`, `UserClient`)
 
 ## 이후 패턴
 - `Domain/<Name>/{Model,Client,Error}`
@@ -20,14 +21,22 @@
 - UseCase 층 없음
 
 ## 주요 진입점
-- `Sources/Auth/AuthClient.swift`
-- `Sources/Auth/AuthSession.swift`
-- `Sources/Auth/AuthError.swift`
-- `Sources/Auth/AuthProvider.swift`
+- `Sources/Auth/Client/AuthClient.swift`
+- `Sources/Auth/Model/AuthSession.swift`
+- `Sources/Auth/Model/AuthProvider.swift`
+- `Sources/Auth/Error/AuthError.swift`
+- `Sources/User/Client/UserClient.swift`
+- `Sources/User/Model/UserProfile.swift`
+- `Sources/User/Model/OnboardingDraft.swift`
+- `Sources/User/Model/Gender.swift`
+- `Sources/User/Model/Interest.swift`
+- `Sources/User/Error/UserError.swift`
 
 ## 테스트 포인트
 - 세션 동등성/Codable 왕복
 - `AuthClient.testValue` 기본 unimplemented 동작 (`@DependencyClient`)
+- User model 동등성/Codable 왕복
+- `UserClient.testValue` 기본 unimplemented 동작 (`@DependencyClient`)
 
 ## 관련 문서
 - [ARCHITECTURE.md](../../docs/ARCHITECTURE.md)
diff --git a/Projects/Domain/Sources/Auth/AuthClient.swift b/Projects/Domain/Sources/Auth/Client/AuthClient.swift
similarity index 100%
rename from Projects/Domain/Sources/Auth/AuthClient.swift
rename to Projects/Domain/Sources/Auth/Client/AuthClient.swift
diff --git a/Projects/Domain/Sources/Auth/AuthError.swift b/Projects/Domain/Sources/Auth/Error/AuthError.swift
similarity index 100%
rename from Projects/Domain/Sources/Auth/AuthError.swift
rename to Projects/Domain/Sources/Auth/Error/AuthError.swift
diff --git a/Projects/Domain/Sources/Auth/AuthProvider.swift b/Projects/Domain/Sources/Auth/Model/AuthProvider.swift
similarity index 100%
rename from Projects/Domain/Sources/Auth/AuthProvider.swift
rename to Projects/Domain/Sources/Auth/Model/AuthProvider.swift
diff --git a/Projects/Domain/Sources/Auth/AuthSession.swift b/Projects/Domain/Sources/Auth/Model/AuthSession.swift
similarity index 100%
rename from Projects/Domain/Sources/Auth/AuthSession.swift
rename to Projects/Domain/Sources/Auth/Model/AuthSession.swift
diff --git a/Projects/Domain/Sources/User/Client/UserClient.swift b/Projects/Domain/Sources/User/Client/UserClient.swift
new file mode 100644
index 0000000..b063ff2
--- /dev/null
+++ b/Projects/Domain/Sources/User/Client/UserClient.swift
@@ -0,0 +1,18 @@
+import Foundation
+import ThirdParty
+
+@DependencyClient
+public struct UserClient: Sendable {
+    public var completeOnboarding: @Sendable (OnboardingDraft) async throws -> AuthSession
+}
+
+extension UserClient: TestDependencyKey {
+    public static let testValue = UserClient()
+}
+
+public extension DependencyValues {
+    var userClient: UserClient {
+        get { self[UserClient.self] }
+        set { self[UserClient.self] = newValue }
+    }
+}
diff --git a/Projects/Domain/Sources/User/Error/UserError.swift b/Projects/Domain/Sources/User/Error/UserError.swift
new file mode 100644
index 0000000..354d473
--- /dev/null
+++ b/Projects/Domain/Sources/User/Error/UserError.swift
@@ -0,0 +1,10 @@
+import Foundation
+
+public enum UserError: Error, Equatable, Sendable {
+    case network
+    case unauthorized
+    case validation(message: String)
+    case updateFailed
+    case storage(message: String)
+    case unknown(message: String)
+}
diff --git a/Projects/Domain/Sources/User/Model/Gender.swift b/Projects/Domain/Sources/User/Model/Gender.swift
new file mode 100644
index 0000000..32288ec
--- /dev/null
+++ b/Projects/Domain/Sources/User/Model/Gender.swift
@@ -0,0 +1,7 @@
+import Foundation
+
+public enum Gender: String, Equatable, Hashable, Sendable, Codable {
+    case male
+    case female
+    case other
+}
diff --git a/Projects/Domain/Sources/User/Model/Interest.swift b/Projects/Domain/Sources/User/Model/Interest.swift
new file mode 100644
index 0000000..cd9bc3d
--- /dev/null
+++ b/Projects/Domain/Sources/User/Model/Interest.swift
@@ -0,0 +1,11 @@
+import Foundation
+
+public struct Interest: Equatable, Hashable, Sendable, Codable {
+    public var id: String
+    public var name: String
+
+    public init(id: String, name: String) {
+        self.id = id
+        self.name = name
+    }
+}
diff --git a/Projects/Domain/Sources/User/Model/OnboardingDraft.swift b/Projects/Domain/Sources/User/Model/OnboardingDraft.swift
new file mode 100644
index 0000000..064a847
--- /dev/null
+++ b/Projects/Domain/Sources/User/Model/OnboardingDraft.swift
@@ -0,0 +1,20 @@
+import Foundation
+
+public struct OnboardingDraft: Equatable, Sendable {
+    public var nickname: String
+    public var gender: Gender
+    public var birthDate: Date
+    public var interestIDs: [String]
+
+    public init(
+        nickname: String,
+        gender: Gender,
+        birthDate: Date,
+        interestIDs: [String]
+    ) {
+        self.nickname = nickname
+        self.gender = gender
+        self.birthDate = birthDate
+        self.interestIDs = interestIDs
+    }
+}
diff --git a/Projects/Domain/Sources/User/Model/UserProfile.swift b/Projects/Domain/Sources/User/Model/UserProfile.swift
new file mode 100644
index 0000000..29dbc7e
--- /dev/null
+++ b/Projects/Domain/Sources/User/Model/UserProfile.swift
@@ -0,0 +1,20 @@
+import Foundation
+
+public struct UserProfile: Equatable, Sendable, Codable {
+    public var nickname: String
+    public var gender: Gender
+    public var birthDate: Date
+    public var interestIDs: [String]
+
+    public init(
+        nickname: String,
+        gender: Gender,
+        birthDate: Date,
+        interestIDs: [String]
+    ) {
+        self.nickname = nickname
+        self.gender = gender
+        self.birthDate = birthDate
+        self.interestIDs = interestIDs
+    }
+}
diff --git a/Projects/Domain/Tests/User/UserClientTests.swift b/Projects/Domain/Tests/User/UserClientTests.swift
new file mode 100644
index 0000000..5d58f8a
--- /dev/null
+++ b/Projects/Domain/Tests/User/UserClientTests.swift
@@ -0,0 +1,11 @@
+import Domain
+import XCTest
+
+final class UserClientTests: XCTestCase {
+    func test_UserClient_testValue는_빈_클라이언트로_생성() {
+        // @DependencyClient 는 testValue = UserClient() 를 기본 제공한다.
+        // 미구현 endpoint 호출 시 issue를 내므로, 생성 가능성만 검증한다.
+        _ = UserClient.testValue
+        XCTAssertTrue(true)
+    }
+}
diff --git a/Projects/Domain/Tests/User/UserModelTests.swift b/Projects/Domain/Tests/User/UserModelTests.swift
new file mode 100644
index 0000000..353bb16
--- /dev/null
+++ b/Projects/Domain/Tests/User/UserModelTests.swift
@@ -0,0 +1,70 @@
+import Domain
+import XCTest
+
+final class UserModelTests: XCTestCase {
+    func test_성별_rawValue와_동등성() {
+        XCTAssertEqual(Gender.male.rawValue, "male")
+        XCTAssertEqual(Gender.female.rawValue, "female")
+        XCTAssertEqual(Gender.other.rawValue, "other")
+        XCTAssertEqual(Gender.male, Gender.male)
+    }
+
+    func test_관심사_동등성_비교() {
+        let a = Interest(id: "sports", name: "운동")
+        let b = Interest(id: "sports", name: "운동")
+        XCTAssertEqual(a, b)
+    }
+
+    func test_관심사_codable_왕복() throws {
+        let original = Interest(id: "music", name: "음악")
+        let data = try JSONEncoder().encode(original)
+        let decoded = try JSONDecoder().decode(Interest.self, from: data)
+        XCTAssertEqual(decoded, original)
+    }
+
+    func test_프로필_동등성_비교() {
+        let birthDate = Date(timeIntervalSince1970: 0)
+        let a = UserProfile(
+            nickname: "모지",
+            gender: .female,
+            birthDate: birthDate,
+            interestIDs: ["sports", "music"]
+        )
+        let b = UserProfile(
+            nickname: "모지",
+            gender: .female,
+            birthDate: birthDate,
+            interestIDs: ["sports", "music"]
+        )
+        XCTAssertEqual(a, b)
+    }
+
+    func test_프로필_codable_왕복() throws {
+        let original = UserProfile(
+            nickname: "모지",
+            gender: .other,
+            birthDate: Date(timeIntervalSince1970: 1_000),
+            interestIDs: ["travel"]
+        )
+        let data = try JSONEncoder().encode(original)
+        let decoded = try JSONDecoder().decode(UserProfile.self, from: data)
+        XCTAssertEqual(decoded, original)
+    }
+
+    func test_온보딩초안_동등성_비교() {
+        let birthDate = Date(timeIntervalSince1970: 2_000)
+        let a = OnboardingDraft(
+            nickname: "모지",
+            gender: .male,
+            birthDate: birthDate,
+            interestIDs: ["food"]
+        )
+        let b = OnboardingDraft(
+            nickname: "모지",
+            gender: .male,
+            birthDate: birthDate,
+            interestIDs: ["food"]
+        )
+        XCTAssertEqual(a, b)
+    }
+}