diff --git a/Src/Notion.Client/Models/Database/Properties/Property.cs b/Src/Notion.Client/Models/Database/Properties/Property.cs
index 163b7ef0..fa0dac50 100644
--- a/Src/Notion.Client/Models/Database/Properties/Property.cs
+++ b/Src/Notion.Client/Models/Database/Properties/Property.cs
@@ -25,6 +25,7 @@ namespace Notion.Client
     [JsonSubtypes.KnownSubTypeAttribute(typeof(StatusProperty), PropertyType.Status)]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(TitleProperty), PropertyType.Title)]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(UrlProperty), PropertyType.Url)]
+    [JsonSubtypes.KnownSubTypeAttribute(typeof(UniqueIdProperty), PropertyType.UniqueId)]
     public class Property
     {
         [JsonProperty("id")]
diff --git a/Src/Notion.Client/Models/Database/Properties/PropertyType.cs b/Src/Notion.Client/Models/Database/Properties/PropertyType.cs
index e4db339a..1d53b2a8 100644
--- a/Src/Notion.Client/Models/Database/Properties/PropertyType.cs
+++ b/Src/Notion.Client/Models/Database/Properties/PropertyType.cs
@@ -67,6 +67,9 @@ public enum PropertyType
         LastEditedTime,
 
         [EnumMember(Value = "status")]
-        Status
+        Status,
+
+        [EnumMember(Value = "unique_id")]
+        UniqueId,        
     }
 }
diff --git a/Src/Notion.Client/Models/Database/Properties/UniqueIdProperty.cs b/Src/Notion.Client/Models/Database/Properties/UniqueIdProperty.cs
new file mode 100644
index 00000000..8b56b462
--- /dev/null
+++ b/Src/Notion.Client/Models/Database/Properties/UniqueIdProperty.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+namespace Notion.Client
+{   
+    public class UniqueIdProperty : Property
+    {
+        public override PropertyType Type => PropertyType.UniqueId;
+
+        [JsonProperty("unique_id")]
+        public Dictionary<string, object> UniqueId { get; set; }
+    }
+}
+
diff --git a/Src/Notion.Client/Models/PropertyValue/PropertyValue.cs b/Src/Notion.Client/Models/PropertyValue/PropertyValue.cs
index c423be82..5f7a6b05 100644
--- a/Src/Notion.Client/Models/PropertyValue/PropertyValue.cs
+++ b/Src/Notion.Client/Models/PropertyValue/PropertyValue.cs
@@ -29,6 +29,7 @@ namespace Notion.Client
     [JsonSubtypes.KnownSubTypeAttribute(typeof(StatusPropertyValue), PropertyValueType.Status)]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(TitlePropertyValue), PropertyValueType.Title)]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(UrlPropertyValue), PropertyValueType.Url)]
+    [JsonSubtypes.KnownSubTypeAttribute(typeof(UniqueIdPropertyValue), PropertyValueType.UniqueId)]
     [SuppressMessage("ReSharper", "UnusedMember.Global")]
     [SuppressMessage("ReSharper", "UnassignedGetOnlyAutoProperty")]
     public class PropertyValue
diff --git a/Src/Notion.Client/Models/PropertyValue/PropertyValueType.cs b/Src/Notion.Client/Models/PropertyValue/PropertyValueType.cs
index 96ddaf77..ca6759c0 100644
--- a/Src/Notion.Client/Models/PropertyValue/PropertyValueType.cs
+++ b/Src/Notion.Client/Models/PropertyValue/PropertyValueType.cs
@@ -70,6 +70,9 @@ public enum PropertyValueType
         LastEditedBy,
 
         [EnumMember(Value = "status")]
-        Status
+        Status,
+
+        [EnumMember(Value = "unique_id")]
+        UniqueId,
     }
 }
diff --git a/Src/Notion.Client/Models/PropertyValue/UniqueIdPropertyValue.cs b/Src/Notion.Client/Models/PropertyValue/UniqueIdPropertyValue.cs
new file mode 100644
index 00000000..716d9cce
--- /dev/null
+++ b/Src/Notion.Client/Models/PropertyValue/UniqueIdPropertyValue.cs
@@ -0,0 +1,29 @@
+using System;
+using Newtonsoft.Json;
+
+namespace Notion.Client
+{
+    /// <summary>
+    ///     Unique Id property value object.
+    /// </summary>
+    public class UniqueIdPropertyValue : PropertyValue
+    {
+        public override PropertyValueType Type => PropertyValueType.UniqueId;
+
+        /// <summary>
+        ///     Unique Id property of database item
+        /// </summary>
+        [JsonProperty("unique_id")]
+        public UniqueIdValue UniqueId { get; set; }
+    }
+
+    public class UniqueIdValue
+    {
+        [JsonProperty("prefix")]
+        public string Prefix { get; set; }
+
+        [JsonProperty("number")]
+        public double? Number { get; set; }
+    }
+}
+
diff --git a/Test/Notion.UnitTests/PropertyTests.cs b/Test/Notion.UnitTests/PropertyTests.cs
index 07949131..fc748413 100644
--- a/Test/Notion.UnitTests/PropertyTests.cs
+++ b/Test/Notion.UnitTests/PropertyTests.cs
@@ -26,6 +26,7 @@ public class PropertyTests
     [InlineData(typeof(SelectProperty), PropertyType.Select)]
     [InlineData(typeof(TitleProperty), PropertyType.Title)]
     [InlineData(typeof(UrlProperty), PropertyType.Url)]
+    [InlineData(typeof(UniqueIdProperty), PropertyType.UniqueId)]
     public void TestPropertyType(Type type, PropertyType expectedPropertyType)
     {
         var typeInstance = (Property)Activator.CreateInstance(type);
@@ -54,6 +55,7 @@ public void TestPropertyType(Type type, PropertyType expectedPropertyType)
     [InlineData(typeof(SelectProperty), "select")]
     [InlineData(typeof(TitleProperty), "title")]
     [InlineData(typeof(UrlProperty), "url")]
+    [InlineData(typeof(UniqueIdProperty), "unique_id")]
     public void TestPropertyTypeText(Type type, string expectedPropertyType)
     {
         var typeInstance = (Property)Activator.CreateInstance(type);