diff --git a/src/models/contest.py b/src/models/contest.py
new file mode 100644
index 0000000..a56ad32
--- /dev/null
+++ b/src/models/contest.py
@@ -0,0 +1,19 @@
+from pydantic import BaseModel, Field
+from uuid import uuid4
+from datetime import datetime
+
+class ContestBase(BaseModel):
+    id: uuid4 = Field(default_factory=uuid4, description="Contest ID. Required.", examples=["3a4c5f1d-3a4c-4f1d-3a4c-5f1d3a4c5f1d"])
+    city_name: str = Field(..., description="Name of the city where the contest is held. Required.", examples=["Helsinki"])
+    date: datetime = Field(..., description="Date when the contest is to be held. Required.", examples=["2024-10-20"])
+    round: int = Field(..., description="Can be one of '1st semifinal' = 1, '2nd semifinal' = 2, 'final' = 3. Required.", examples=["1"])
+    is_active: bool = Field(default=False, description="Is the contest active? Default is False.", examples=["False"])
+
+class ContestCreate(ContestBase):
+    pass
+
+class ContestUpdate(ContestBase):
+    pass
+
+class ContestOut(ContestBase):
+    pass
diff --git a/src/models/song.py b/src/models/song.py
new file mode 100644
index 0000000..872d48b
--- /dev/null
+++ b/src/models/song.py
@@ -0,0 +1,20 @@
+from pydantic import BaseModel, Field
+from uuid import UUID, uuid4
+
+
+class SongBase(BaseModel):
+    id: uuid4 = Field(default_factory=uuid4, description="Song ID. Required.", examples=["3a4c5f1d-3a4c-4f1d-3a4c-5f1d3a4c5f1d"])
+
+class SongIn(SongBase):
+    artist: str = Field(..., description="Artist of the song. Required.", examples=["Matti Meikäläinen"])
+    song_name: str = Field(..., description="Name of the song. Required.", examples=["Moi"])
+    country: str = Field(..., description="Country where the song is from. Required.", examples=["Finland"])
+
+class SongReview(SongBase):
+    contest_id: UUID = Field(..., description="Contest ID. Required.", examples=["3a4c5f1d-3a4c-4f1d-3a4c-5f1d3a4c5f1d"])
+    song_id: UUID = Field(..., description="Song ID. Required.", examples=["3a4c5f1d-3a4c-4f1d-3a4c-5f1d3a4c5f1d"])
+    reviewer_id: UUID = Field(..., description="Reviewer ID. Required.", examples=["3a4c5f1d-3a4c-4f1d-3a4c-5f1d3a4c5f1d"])
+    song_score: int = Field(..., description="Song score. Required.", examples=[50])
+    wardrobe_score: int = Field(..., description="Wardrobe score. Required.", examples=[50])
+    stage_show_score: int = Field(..., description="Stage show score. Required.", examples=[50])
+    review_text: str | None = Field(None, description="Review text. Optional.", examples=["Great song!"])
diff --git a/src/models/user.py b/src/models/user.py
new file mode 100644
index 0000000..ba9275e
--- /dev/null
+++ b/src/models/user.py
@@ -0,0 +1,22 @@
+from pydantic import BaseModel, Field
+from uuid import uuid4
+from datetime import datetime
+
+
+class UserBase(BaseModel):
+    username: str = Field(..., description="Username. Required.", examples=["mmeikala"])
+
+class UserIn(UserBase):
+    password: str = Field(..., description="Hashed password. Required.", examples=["p455w0rd"])
+
+class UserCreate(UserBase):
+    id: uuid4 = Field(default_factory=uuid4, description="User ID. Required.", examples=["3a4c5f1d-3a4c-4f1d-3a4c-5f1d3a4c5f1d"])
+    name: str | None = Field(None, description="Real name of the user. Optional.", examples=["Matti Meikäläinen"])
+    email: str | None = Field(None, description="Email address of the user. Optional.", examples=["mmeikala@yhteys.fi"])
+    group_id: uuid4 = Field(..., description="Group ID. Required.", examples=["3a4c5f1d-3a4c-4f1d-3a4c-5f1d3a4c5f1d"])
+
+class UserOut(UserCreate):
+    last_login: datetime | None = Field(None, description="Last login time. Is null by default. Updated automatically.", examples=["2024-10-20 12:00:00"])
+    created_at: datetime = Field(default_factory=datetime.now, description="Creation time. Defaults to current time.", examples=["2024-10-20 12:00:00"])
+    modified_at: datetime = Field(default_factory=datetime.now, description="Modification time. Defaults to current time.", examples=["2024-10-20 12:00:00"])
+