diff --git a/sdk/core/azure_core/CHANGELOG.md b/sdk/core/azure_core/CHANGELOG.md
index 4e23dd4293..eebb7ce271 100644
--- a/sdk/core/azure_core/CHANGELOG.md
+++ b/sdk/core/azure_core/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ### Features Added
 
+- Added `UrlExt::append_path()`.
+
 ### Breaking Changes
 
 - Moved deserializers and serializers for optional base64-encoded bytes to `base64::option` module. `base64` module now deserializes or serializes non-optional fields congruent with the `time` module.
diff --git a/sdk/core/azure_core/src/http/mod.rs b/sdk/core/azure_core/src/http/mod.rs
index 035017810a..e4740f1b07 100644
--- a/sdk/core/azure_core/src/http/mod.rs
+++ b/sdk/core/azure_core/src/http/mod.rs
@@ -23,7 +23,7 @@ pub use response::{AsyncResponse, BufResponse, RawResponse, Response};
 pub use typespec_client_core::http::response;
 pub use typespec_client_core::http::{
     new_http_client, AppendToUrlQuery, Context, DeserializeWith, Format, HttpClient, JsonFormat,
-    Method, NoFormat, StatusCode, Url,
+    Method, NoFormat, StatusCode, Url, UrlExt,
 };
 
 pub use crate::error::check_success;
diff --git a/sdk/core/typespec_client_core/CHANGELOG.md b/sdk/core/typespec_client_core/CHANGELOG.md
index cfc5d5df1d..6673f37cdb 100644
--- a/sdk/core/typespec_client_core/CHANGELOG.md
+++ b/sdk/core/typespec_client_core/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ### Features Added
 
+- Added `UrlExt::append_path()`.
+
 ### Breaking Changes
 
 - Moved deserializers and serializers for optional base64-encoded bytes to `base64::option` module. `base64` module now deserializes or serializes non-optional fields congruent with the `time` module.
diff --git a/sdk/core/typespec_client_core/src/http/mod.rs b/sdk/core/typespec_client_core/src/http/mod.rs
index 6f1d39d1a3..27f351b1d2 100644
--- a/sdk/core/typespec_client_core/src/http/mod.rs
+++ b/sdk/core/typespec_client_core/src/http/mod.rs
@@ -59,3 +59,153 @@ where
         }
     }
 }
+
+/// Extension trait for [`Url`] to provide additional URL manipulation methods.
+pub trait UrlExt: crate::private::Sealed {
+    /// Appends a path segment to the URL's path, handling slashes appropriately and preserving query parameters.
+    ///
+    /// This always assumes the existing URL terminates with a directory, and the `path` you pass in is a separate directory or file segment.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use typespec_client_core::http::{Url, UrlExt as _};
+    ///
+    /// let mut url: Url = "https://contoso.com/foo?a=1".parse().unwrap();
+    /// url.append_path("bar");
+    /// assert_eq!(url.as_str(), "https://contoso.com/foo/bar?a=1");
+    /// ```
+    fn append_path(&mut self, path: impl AsRef<str>);
+}
+
+impl UrlExt for Url {
+    fn append_path(&mut self, p: impl AsRef<str>) {
+        let path = p.as_ref().trim_start_matches('/');
+        if self.path() == "/" {
+            self.set_path(path);
+            return;
+        }
+        if path.is_empty() {
+            return;
+        }
+        let needs_separator = !self.path().ends_with('/');
+        let mut new_len = self.path().len() + path.len();
+        if needs_separator {
+            new_len += 1;
+        }
+        let mut new_path = String::with_capacity(new_len);
+        debug_assert_eq!(new_path.capacity(), new_len);
+        new_path.push_str(self.path());
+        if needs_separator {
+            new_path.push('/');
+        }
+        new_path.push_str(path);
+        debug_assert_eq!(new_path.capacity(), new_len);
+
+        self.set_path(&new_path);
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn url_append_path() {
+        let mut url = Url::parse("https://www.microsoft.com?q=q").unwrap();
+        url.append_path("foo");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo?q=q");
+
+        url = Url::parse("https://www.microsoft.com/?q=q").unwrap();
+        url.append_path("foo");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo?q=q");
+
+        url = Url::parse("https://www.microsoft.com?q=q").unwrap();
+        url.append_path("/foo");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo?q=q");
+
+        url = Url::parse("https://www.microsoft.com/?q=q").unwrap();
+        url.append_path("/foo");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo?q=q");
+
+        url = Url::parse("https://www.microsoft.com?q=q").unwrap();
+        url.append_path("foo/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/?q=q").unwrap();
+        url.append_path("foo/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/?q=q");
+
+        url = Url::parse("https://www.microsoft.com?q=q").unwrap();
+        url.append_path("/foo/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/?q=q").unwrap();
+        url.append_path("/foo/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo?q=q").unwrap();
+        url.append_path("bar");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo/?q=q").unwrap();
+        url.append_path("bar");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo?q=q").unwrap();
+        url.append_path("/bar");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo/?q=q").unwrap();
+        url.append_path("/bar");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo?q=q").unwrap();
+        url.append_path("bar/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo/?q=q").unwrap();
+        url.append_path("bar/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo?q=q").unwrap();
+        url.append_path("/bar/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo/?q=q").unwrap();
+        url.append_path("/bar/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/bar/?q=q");
+
+        url = Url::parse("https://www.microsoft.com?q=q").unwrap();
+        url.append_path("/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/?q=q").unwrap();
+        url.append_path("/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/?q=q");
+
+        url = Url::parse("https://www.microsoft.com?q=q").unwrap();
+        url.append_path("");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/?q=q");
+
+        url = Url::parse("https://www.microsoft.com?q=q").unwrap();
+        url.append_path("");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo?q=q").unwrap();
+        url.append_path("/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo/?q=q").unwrap();
+        url.append_path("/");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo?q=q").unwrap();
+        url.append_path("");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo?q=q");
+
+        url = Url::parse("https://www.microsoft.com/foo/?q=q").unwrap();
+        url.append_path("");
+        assert_eq!(url.as_str(), "https://www.microsoft.com/foo/?q=q");
+    }
+}
diff --git a/sdk/core/typespec_client_core/src/lib.rs b/sdk/core/typespec_client_core/src/lib.rs
index ab087ea5a6..2b43b46787 100644
--- a/sdk/core/typespec_client_core/src/lib.rs
+++ b/sdk/core/typespec_client_core/src/lib.rs
@@ -26,3 +26,8 @@ pub use typespec::Bytes;
 pub use uuid::Uuid;
 
 pub use sleep::sleep;
+
+mod private {
+    pub trait Sealed {}
+    impl Sealed for crate::http::Url {}
+}