diff --git a/CHANGELOG.md b/CHANGELOG.md
index f9ea8d394a..e4d113a93e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Features
+
+- Extended `SentryThread` by `Main` to allow indication whether the thread is considered the current main thread ([#4807](https://github.com/getsentry/sentry-dotnet/pull/4807))
+
 ## 6.0.0
 
 ### BREAKING CHANGES
@@ -45,25 +51,24 @@
 - Deliver system breadcrumbs in the main thread on Android ([#4671](https://github.com/getsentry/sentry-dotnet/pull/4671))
 - The `Serilog` integration captures _Structured Logs_ (when enabled) independently of captured Events and added Breadcrumbs ([#4691](https://github.com/getsentry/sentry-dotnet/pull/4691))
 - Minimum Log-Level for _Structured Logs_, _Breadcrumbs_ and _Events_ in all Logging-Integrations ([#4700](https://github.com/getsentry/sentry-dotnet/pull/4700))
-    - for `Sentry.Extensions.Logging`, `Sentry.AspNetCore`, `Sentry.Maui` and `Sentry.Google.Cloud.Functions`
-    - the Logger-Provider for _Breadcrumbs_ and _Events_ ignores Logging-Configuration (e.g. via `appsettings.json`)
-        - use the intended `SentryLoggingOptions.MinimumBreadcrumbLevel`, `SentryLoggingOptions.MinimumEventLevel`, or add filter functions via `SentryLoggingOptionsExtensions.AddLogEntryFilter`
-    - the Logger-Provider for _Structured Logs_ respects Logging-Configuration (e.g. via `appsettings.json`)
-        - when enabled by `SentryOptions.EnableLogs`
+  - for `Sentry.Extensions.Logging`, `Sentry.AspNetCore`, `Sentry.Maui` and `Sentry.Google.Cloud.Functions`
+  - the Logger-Provider for _Breadcrumbs_ and _Events_ ignores Logging-Configuration (e.g. via `appsettings.json`)
+    - use the intended `SentryLoggingOptions.MinimumBreadcrumbLevel`, `SentryLoggingOptions.MinimumEventLevel`, or add filter functions via `SentryLoggingOptionsExtensions.AddLogEntryFilter`
+  - the Logger-Provider for _Structured Logs_ respects Logging-Configuration (e.g. via `appsettings.json`)
+    - when enabled by `SentryOptions.EnableLogs`
 - Avoid appending `/NODEFAULTLIB:MSVCRT` to NativeAOT linker arguments on Windows when targetting non-Windows platforms (Android, Browser) ([#4760](https://github.com/getsentry/sentry-dotnet/pull/4760))
 - The SDK avoids redundant scope sync after transaction finish ([#4623](https://github.com/getsentry/sentry-dotnet/pull/4623))
 - sentry-native is now automatically disabled for WASM applications ([#4631](https://github.com/getsentry/sentry-dotnet/pull/4631))
 - Remove unnecessary files from SentryCocoaFramework before packing ([#4602](https://github.com/getsentry/sentry-dotnet/pull/4602))
 
-
 ### Dependencies
 
 - Bump Java SDK from v8.24.0 to v8.28.0 ([#4728](https://github.com/getsentry/sentry-dotnet/pull/4728), [#4761](https://github.com/getsentry/sentry-dotnet/pull/4761), [#4791](https://github.com/getsentry/sentry-dotnet/pull/4791))
-    - [changelog](https://github.com/getsentry/sentry-java/blob/main/CHANGELOG.md#8280)
-    - [diff](https://github.com/getsentry/sentry-java/compare/8.24.0...8.28.0)
+  - [changelog](https://github.com/getsentry/sentry-java/blob/main/CHANGELOG.md#8280)
+  - [diff](https://github.com/getsentry/sentry-java/compare/8.24.0...8.28.0)
 - Bump Native SDK from v0.12.0 to v0.12.2 ([#4690](https://github.com/getsentry/sentry-dotnet/pull/4690), [#4737](https://github.com/getsentry/sentry-dotnet/pull/4737), [#4780](https://github.com/getsentry/sentry-dotnet/pull/4780))
-    - [changelog](https://github.com/getsentry/sentry-native/blob/master/CHANGELOG.md#0122)
-    - [diff](https://github.com/getsentry/sentry-native/compare/0.12.0...0.12.2)
+  - [changelog](https://github.com/getsentry/sentry-native/blob/master/CHANGELOG.md#0122)
+  - [diff](https://github.com/getsentry/sentry-native/compare/0.12.0...0.12.2)
 - Bump Cocoa SDK from v8.57.1 to v8.57.3 ([#4704](https://github.com/getsentry/sentry-dotnet/pull/4704), [#4738](https://github.com/getsentry/sentry-dotnet/pull/4738))
   - [changelog](https://github.com/getsentry/sentry-cocoa/blob/main/CHANGELOG.md#8573)
   - [diff](https://github.com/getsentry/sentry-cocoa/compare/8.57.1...8.57.3)
diff --git a/src/Sentry/SentryThread.cs b/src/Sentry/SentryThread.cs
index 6ce62eff7b..d537095e7c 100644
--- a/src/Sentry/SentryThread.cs
+++ b/src/Sentry/SentryThread.cs
@@ -29,6 +29,13 @@ public sealed class SentryThread : ISentryJsonSerializable
     /// </summary>
     public bool? Current { get; set; }
 
+    /// <summary>
+    /// An optional flag to indicate whether the thread was responsible for rendering
+    /// the user interface. On mobile and desktop platforms this is oftentimes referred to as the
+    /// "main thread" or "ui thread".
+    /// </summary>
+    public bool? Main { get; set; }
+
     /// <summary>
     /// Stack trace.
     /// </summary>
@@ -44,6 +51,7 @@ public void WriteTo(Utf8JsonWriter writer, IDiagnosticLogger? logger)
         writer.WriteStringIfNotWhiteSpace("name", Name);
         writer.WriteBooleanIfNotNull("crashed", Crashed);
         writer.WriteBooleanIfNotNull("current", Current);
+        writer.WriteBooleanIfNotNull("main", Main);
         writer.WriteSerializableIfNotNull("stacktrace", Stacktrace, logger);
 
         writer.WriteEndObject();
@@ -58,6 +66,7 @@ public static SentryThread FromJson(JsonElement json)
         var name = json.GetPropertyOrNull("name")?.GetString();
         var crashed = json.GetPropertyOrNull("crashed")?.GetBoolean();
         var current = json.GetPropertyOrNull("current")?.GetBoolean();
+        var main = json.GetPropertyOrNull("main")?.GetBoolean();
         var stacktrace = json.GetPropertyOrNull("stacktrace")?.Pipe(SentryStackTrace.FromJson);
 
         return new SentryThread
@@ -66,6 +75,7 @@ public static SentryThread FromJson(JsonElement json)
             Name = name,
             Crashed = crashed,
             Current = current,
+            Main = main,
             Stacktrace = stacktrace
         };
     }
diff --git a/test/Sentry.Tests/ApiApprovalTests.Run.DotNet10_0.verified.txt b/test/Sentry.Tests/ApiApprovalTests.Run.DotNet10_0.verified.txt
index e32ad6e60c..458d39be99 100644
--- a/test/Sentry.Tests/ApiApprovalTests.Run.DotNet10_0.verified.txt
+++ b/test/Sentry.Tests/ApiApprovalTests.Run.DotNet10_0.verified.txt
@@ -996,6 +996,7 @@ namespace Sentry
         public bool? Crashed { get; set; }
         public bool? Current { get; set; }
         public int? Id { get; set; }
+        public bool? Main { get; set; }
         public string? Name { get; set; }
         public Sentry.SentryStackTrace? Stacktrace { get; set; }
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
diff --git a/test/Sentry.Tests/ApiApprovalTests.Run.DotNet8_0.verified.txt b/test/Sentry.Tests/ApiApprovalTests.Run.DotNet8_0.verified.txt
index e32ad6e60c..458d39be99 100644
--- a/test/Sentry.Tests/ApiApprovalTests.Run.DotNet8_0.verified.txt
+++ b/test/Sentry.Tests/ApiApprovalTests.Run.DotNet8_0.verified.txt
@@ -996,6 +996,7 @@ namespace Sentry
         public bool? Crashed { get; set; }
         public bool? Current { get; set; }
         public int? Id { get; set; }
+        public bool? Main { get; set; }
         public string? Name { get; set; }
         public Sentry.SentryStackTrace? Stacktrace { get; set; }
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
diff --git a/test/Sentry.Tests/ApiApprovalTests.Run.DotNet9_0.verified.txt b/test/Sentry.Tests/ApiApprovalTests.Run.DotNet9_0.verified.txt
index e32ad6e60c..458d39be99 100644
--- a/test/Sentry.Tests/ApiApprovalTests.Run.DotNet9_0.verified.txt
+++ b/test/Sentry.Tests/ApiApprovalTests.Run.DotNet9_0.verified.txt
@@ -996,6 +996,7 @@ namespace Sentry
         public bool? Crashed { get; set; }
         public bool? Current { get; set; }
         public int? Id { get; set; }
+        public bool? Main { get; set; }
         public string? Name { get; set; }
         public Sentry.SentryStackTrace? Stacktrace { get; set; }
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
diff --git a/test/Sentry.Tests/ApiApprovalTests.Run.Net4_8.verified.txt b/test/Sentry.Tests/ApiApprovalTests.Run.Net4_8.verified.txt
index bd8e747a1b..f2b22fbfdb 100644
--- a/test/Sentry.Tests/ApiApprovalTests.Run.Net4_8.verified.txt
+++ b/test/Sentry.Tests/ApiApprovalTests.Run.Net4_8.verified.txt
@@ -972,6 +972,7 @@ namespace Sentry
         public bool? Crashed { get; set; }
         public bool? Current { get; set; }
         public int? Id { get; set; }
+        public bool? Main { get; set; }
         public string? Name { get; set; }
         public Sentry.SentryStackTrace? Stacktrace { get; set; }
         public void WriteTo(System.Text.Json.Utf8JsonWriter writer, Sentry.Extensibility.IDiagnosticLogger? logger) { }
diff --git a/test/Sentry.Tests/Protocol/SentryThreadTests.cs b/test/Sentry.Tests/Protocol/SentryThreadTests.cs
index a881c64e41..c5f5aa592c 100644
--- a/test/Sentry.Tests/Protocol/SentryThreadTests.cs
+++ b/test/Sentry.Tests/Protocol/SentryThreadTests.cs
@@ -16,6 +16,7 @@ public void SerializeObject_AllPropertiesSetToNonDefault_SerializesValidObject()
         {
             Crashed = true,
             Current = true,
+            Main = true,
             Id = 0,
             Name = "thread11",
             Stacktrace = new SentryStackTrace
@@ -35,6 +36,7 @@ public void SerializeObject_AllPropertiesSetToNonDefault_SerializesValidObject()
               "name": "thread11",
               "crashed": true,
               "current": true,
+              "main": true,
               "stacktrace": {
                 "frames": [
                   {
@@ -62,6 +64,8 @@ public static IEnumerable<object[]> TestCases()
         yield return new object[] { (new SentryThread { Name = "some name" }, """{"name":"some name"}""") };
         yield return new object[] { (new SentryThread { Crashed = false }, """{"crashed":false}""") };
         yield return new object[] { (new SentryThread { Current = false }, """{"current":false}""") };
+        yield return new object[] { (new SentryThread { Main = false }, """{"main":false}""") };
+        yield return new object[] { (new SentryThread { Main = true }, """{"main":true}""") };
         yield return new object[] { (new SentryThread { Id = 200 }, """{"id":200}""") };
         yield return new object[] { (new SentryThread { Stacktrace = new SentryStackTrace { Frames = { new SentryStackFrame { InApp = true } } } },
             """{"stacktrace":{"frames":[{"in_app":true}]}}""") };