diff --git a/src/Sentry/Platforms/Cocoa/Extensions/CocoaExtensions.cs b/src/Sentry/Platforms/Cocoa/Extensions/CocoaExtensions.cs
index cf6776a450..05ae6911be 100644
--- a/src/Sentry/Platforms/Cocoa/Extensions/CocoaExtensions.cs
+++ b/src/Sentry/Platforms/Cocoa/Extensions/CocoaExtensions.cs
@@ -195,6 +195,37 @@ public static NSDictionary<NSString, NSString> ToNSDictionaryStrings(
         this IReadOnlyCollection<KeyValuePair<string, TValue>> dict) =>
         dict.Count == 0 ? null : dict.ToNSDictionary();
 
+    public static NSDictionary<NSString, NSObject>? ToCocoaBreadcrumbData(
+        this IReadOnlyDictionary<string, string> source)
+    {
+        // Avoid an allocation if we can
+        if (source.Count == 0)
+        {
+            return null;
+        }
+
+        var dict = new NSDictionary<NSString, NSObject>();
+
+        foreach (var (key, value) in source)
+        {
+            // Cocoa Session Replay expects `request_start` to be a Date (`NSDate`).
+            // See https://github.com/getsentry/sentry-cocoa/blob/2b4e787e55558e1475eda8f98b02c19a0d511741/Sources/Swift/Integrations/SessionReplay/SentrySRDefaultBreadcrumbConverter.swift#L73
+            if (key == SentryHttpMessageHandler.RequestStartKey && TryParseUnixMs(value, out var unixMs))
+            {
+                var dto = DateTimeOffset.FromUnixTimeMilliseconds(unixMs);
+                dict[key] = dto.ToNSDate();
+                continue;
+            }
+
+            dict[key] = NSObject.FromObject(value);
+        }
+
+        return dict.Count == 0 ? null : dict;
+
+        static bool TryParseUnixMs(string value, out long unixMs) =>
+            long.TryParse(value, NumberStyles.Integer, CultureInfo.InvariantCulture, out unixMs);
+    }
+
     /// <summary>
     /// Converts an <see cref="NSNumber"/> to a .NET primitive data type and returns the result box in an <see cref="object"/>.
     /// </summary>
diff --git a/src/Sentry/SentryHttpMessageHandler.cs b/src/Sentry/SentryHttpMessageHandler.cs
index 7792bbc2d6..c2aca78cdf 100644
--- a/src/Sentry/SentryHttpMessageHandler.cs
+++ b/src/Sentry/SentryHttpMessageHandler.cs
@@ -17,6 +17,7 @@ public class SentryHttpMessageHandler : SentryMessageHandler
     internal const string HttpClientOrigin = "auto.http.client";
     internal const string HttpStartTimestampKey = "http.start_timestamp";
     internal const string HttpEndTimestampKey = "http.end_timestamp";
+    internal const string RequestStartKey = "request_start";
 
     /// <summary>
     /// Constructs an instance of <see cref="SentryHttpMessageHandler"/>.
@@ -93,10 +94,16 @@ protected internal override void HandleResponse(HttpResponseMessage response, IS
         };
         if (span is not null)
         {
+#if ANDROID
             // Ensure the breadcrumb can be converted to RRWeb so that it shows up in the network tab in Session Replay.
             // See https://github.com/getsentry/sentry-java/blob/94bff8dc0a952ad8c1b6815a9eda5005e41b92c7/sentry-android-replay/src/main/java/io/sentry/android/replay/DefaultReplayBreadcrumbConverter.kt#L195-L199
             breadcrumbData[HttpStartTimestampKey] = span.StartTimestamp.ToUnixTimeMilliseconds().ToString("F0", CultureInfo.InvariantCulture);
             breadcrumbData[HttpEndTimestampKey] = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds().ToString("F0", CultureInfo.InvariantCulture);
+#elif IOS || MACCATALYST
+            // Ensure the breadcrumb can be converted to RRWeb so that it shows up in the network tab in Session Replay.
+            // See https://github.com/getsentry/sentry-cocoa/blob/2b4e787e55558e1475eda8f98b02c19a0d511741/Sources/Swift/Integrations/SessionReplay/SentrySRDefaultBreadcrumbConverter.swift#L70-L86
+            breadcrumbData[RequestStartKey] = span.StartTimestamp.ToUnixTimeMilliseconds().ToString("F0", CultureInfo.InvariantCulture);
+#endif
         }
         _hub.AddBreadcrumb(string.Empty, "http", "http", breadcrumbData);
 
diff --git a/test/Sentry.Tests/SentryHttpMessageHandlerTests.cs b/test/Sentry.Tests/SentryHttpMessageHandlerTests.cs
index d7edeff711..14009a6549 100644
--- a/test/Sentry.Tests/SentryHttpMessageHandlerTests.cs
+++ b/test/Sentry.Tests/SentryHttpMessageHandlerTests.cs
@@ -613,6 +613,7 @@ public void Send_Executed_BreadcrumbCreated()
     }
 #endif
 
+#if ANDROID || IOS || MACCATALYST
     [Fact]
     public void HandleResponse_SpanExists_AddsReplayBreadcrumbData()
     {
@@ -644,6 +645,7 @@ public void HandleResponse_SpanExists_AddsReplayBreadcrumbData()
         breadcrumb.Category.Should().Be("http");
 
         breadcrumb.Data.Should().NotBeNull();
+#if ANDROID
         breadcrumb.Data!.Should().ContainKey(SentryHttpMessageHandler.HttpStartTimestampKey);
         breadcrumb.Data.Should().ContainKey(SentryHttpMessageHandler.HttpEndTimestampKey);
 
@@ -651,11 +653,17 @@ public void HandleResponse_SpanExists_AddsReplayBreadcrumbData()
             .Should().BeTrue();
         long.TryParse(breadcrumb.Data![SentryHttpMessageHandler.HttpEndTimestampKey], NumberStyles.Integer, CultureInfo.InvariantCulture, out var endMs)
             .Should().BeTrue();
-
         startMs.Should().BeGreaterThan(0);
         startMs.Should().Be(span.StartTimestamp.ToUnixTimeMilliseconds());
         endMs.Should().BeGreaterThan(0);
         endMs.Should().BeGreaterOrEqualTo(startMs);
+#elif IOS || MACCATALYST
+        breadcrumb.Data!.Should().ContainKey(SentryHttpMessageHandler.RequestStartKey);
+        long.TryParse(breadcrumb.Data![SentryHttpMessageHandler.RequestStartKey], NumberStyles.Integer, CultureInfo.InvariantCulture, out var startMs)
+            .Should().BeTrue();
+        startMs.Should().BeGreaterThan(0);
+        startMs.Should().Be(span.StartTimestamp.ToUnixTimeMilliseconds());
+#endif
     }
 
     [Fact]
@@ -680,5 +688,7 @@ public void HandleResponse_NoSpanExists_NoReplayBreadcrumbData()
         breadcrumb.Data.Should().NotBeNull();
         breadcrumb.Data!.Should().NotContainKey(SentryHttpMessageHandler.HttpStartTimestampKey);
         breadcrumb.Data.Should().NotContainKey(SentryHttpMessageHandler.HttpEndTimestampKey);
+        breadcrumb.Data.Should().NotContainKey(SentryHttpMessageHandler.RequestStartKey);
     }
+#endif
 }