diff --git a/Cargo.toml b/Cargo.toml
index e597fa5..7c30905 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [workspace]
 members = [
     "web-transport",
+    "web-transport-any",
     "web-transport-proto",
     "web-transport-quiche",
     "web-transport-quinn",
@@ -11,5 +12,6 @@ members = [
 resolver = "2"
 
 [workspace.dependencies]
+web-transport-any = { path = "web-transport-any", version = "0.1" }
 web-transport-proto = { path = "web-transport-proto", version = "0.3" }
 web-transport-trait = { path = "web-transport-trait", version = "0.3" }
diff --git a/web-transport-any/Cargo.toml b/web-transport-any/Cargo.toml
new file mode 100644
index 0000000..e3e69b9
--- /dev/null
+++ b/web-transport-any/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "web-transport-any"
+description = "Concrete wrapper for all known WebTransport implementors."
+authors = ["Luke Curley", "Jeremy Hiatt"]
+repository = "https://github.com/moq-dev/web-transport"
+license = "MIT OR Apache-2.0"
+
+version = "0.1.0"
+edition = "2021"
+
+keywords = ["quic", "http3", "webtransport", "websocket"]
+categories = ["network-programming", "web-programming"]
+
+[dependencies]
+bytes = "1"
+web-transport-trait = { workspace = true }
+web-transport-quinn = { path = "../web-transport-quinn" }
+web-transport-ws = { path = "../web-transport-ws" }
diff --git a/web-transport-any/src/lib.rs b/web-transport-any/src/lib.rs
new file mode 100644
index 0000000..68fe654
--- /dev/null
+++ b/web-transport-any/src/lib.rs
@@ -0,0 +1,298 @@
+/// Unified WebTransport session that can be either Quinn (QUIC) or WebSocket
+#[derive(Clone)]
+pub enum WebTransportSessionAny {
+    Quinn(web_transport_quinn::Session),
+    WebSocket(web_transport_ws::Session),
+}
+
+impl From<web_transport_quinn::Session> for WebTransportSessionAny {
+    fn from(session: web_transport_quinn::Session) -> Self {
+        WebTransportSessionAny::Quinn(session)
+    }
+}
+
+impl From<web_transport_ws::Session> for WebTransportSessionAny {
+    fn from(session: web_transport_ws::Session) -> Self {
+        WebTransportSessionAny::WebSocket(session)
+    }
+}
+
+impl WebTransportSessionAny {
+    /// Returns the underlying web_transport_quinn::Session if this is a Quinn transport,
+    /// or panics if it's a WebSocket transport.
+    ///
+    /// For backward compatibility with code expecting web_transport_quinn::Session.
+    /// New code should handle both variants properly.
+    pub fn into_quic(self) -> web_transport_quinn::Session {
+        match self {
+            WebTransportSessionAny::Quinn(session) => session,
+            WebTransportSessionAny::WebSocket(_) => {
+                panic!("Expected Quinn session but got WebSocket")
+            }
+        }
+    }
+}
+
+// Unified error type that can hold either transport's error
+#[derive(Debug)]
+pub enum WebTransportErrorAny {
+    QuinnSession(web_transport_quinn::SessionError),
+    QuinnWrite(web_transport_quinn::WriteError),
+    QuinnRead(web_transport_quinn::ReadError),
+    WebSocket(web_transport_ws::Error),
+}
+
+impl std::fmt::Display for WebTransportErrorAny {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            WebTransportErrorAny::QuinnSession(e) => write!(f, "Quinn session error: {}", e),
+            WebTransportErrorAny::QuinnWrite(e) => write!(f, "Quinn write error: {}", e),
+            WebTransportErrorAny::QuinnRead(e) => write!(f, "Quinn read error: {}", e),
+            WebTransportErrorAny::WebSocket(e) => write!(f, "WebSocket error: {}", e),
+        }
+    }
+}
+
+impl std::error::Error for WebTransportErrorAny {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            WebTransportErrorAny::QuinnSession(e) => Some(e),
+            WebTransportErrorAny::QuinnWrite(e) => Some(e),
+            WebTransportErrorAny::QuinnRead(e) => Some(e),
+            WebTransportErrorAny::WebSocket(e) => Some(e),
+        }
+    }
+}
+
+impl web_transport_trait::Error for WebTransportErrorAny {
+    fn session_error(&self) -> Option<(u32, String)> {
+        match self {
+            WebTransportErrorAny::QuinnSession(e) => e.session_error(),
+            WebTransportErrorAny::QuinnWrite(e) => e.session_error(),
+            WebTransportErrorAny::QuinnRead(e) => e.session_error(),
+            WebTransportErrorAny::WebSocket(e) => e.session_error(),
+        }
+    }
+}
+
+impl From<web_transport_quinn::SessionError> for WebTransportErrorAny {
+    fn from(error: web_transport_quinn::SessionError) -> Self {
+        WebTransportErrorAny::QuinnSession(error)
+    }
+}
+
+impl From<web_transport_quinn::WriteError> for WebTransportErrorAny {
+    fn from(error: web_transport_quinn::WriteError) -> Self {
+        WebTransportErrorAny::QuinnWrite(error)
+    }
+}
+
+impl From<web_transport_quinn::ReadError> for WebTransportErrorAny {
+    fn from(error: web_transport_quinn::ReadError) -> Self {
+        WebTransportErrorAny::QuinnRead(error)
+    }
+}
+
+impl From<web_transport_ws::Error> for WebTransportErrorAny {
+    fn from(error: web_transport_ws::Error) -> Self {
+        WebTransportErrorAny::WebSocket(error)
+    }
+}
+
+// Unified stream types
+pub enum WebTransportSendStreamAny {
+    Quinn(web_transport_quinn::SendStream),
+    WebSocket(web_transport_ws::SendStream),
+}
+
+impl web_transport_trait::SendStream for WebTransportSendStreamAny {
+    type Error = WebTransportErrorAny;
+
+    async fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
+        match self {
+            WebTransportSendStreamAny::Quinn(s) => s.write(buf).await.map_err(Into::into),
+            WebTransportSendStreamAny::WebSocket(s) => s.write(buf).await.map_err(Into::into),
+        }
+    }
+
+    fn set_priority(&mut self, order: u8) {
+        match self {
+            WebTransportSendStreamAny::Quinn(s) => s.set_priority(order),
+            WebTransportSendStreamAny::WebSocket(s) => s.set_priority(order),
+        }
+    }
+
+    fn reset(&mut self, code: u32) {
+        match self {
+            WebTransportSendStreamAny::Quinn(s) => {
+                let _ = s.reset(code);
+            }
+            WebTransportSendStreamAny::WebSocket(s) => s.reset(code),
+        }
+    }
+
+    fn finish(&mut self) -> Result<(), Self::Error> {
+        match self {
+            WebTransportSendStreamAny::Quinn(s) => {
+                web_transport_trait::SendStream::finish(s).map_err(Into::into)
+            }
+            WebTransportSendStreamAny::WebSocket(s) => s.finish().map_err(Into::into),
+        }
+    }
+
+    async fn closed(&mut self) -> Result<(), Self::Error> {
+        match self {
+            WebTransportSendStreamAny::Quinn(s) => s.closed().await.map_err(Into::into),
+            WebTransportSendStreamAny::WebSocket(s) => s.closed().await.map_err(Into::into),
+        }
+    }
+}
+
+impl From<web_transport_quinn::SendStream> for WebTransportSendStreamAny {
+    fn from(stream: web_transport_quinn::SendStream) -> Self {
+        WebTransportSendStreamAny::Quinn(stream)
+    }
+}
+
+impl From<web_transport_ws::SendStream> for WebTransportSendStreamAny {
+    fn from(stream: web_transport_ws::SendStream) -> Self {
+        WebTransportSendStreamAny::WebSocket(stream)
+    }
+}
+
+pub enum WebTransportRecvStreamAny {
+    Quinn(web_transport_quinn::RecvStream),
+    WebSocket(web_transport_ws::RecvStream),
+}
+
+impl web_transport_trait::RecvStream for WebTransportRecvStreamAny {
+    type Error = WebTransportErrorAny;
+
+    async fn read(&mut self, dst: &mut [u8]) -> Result<Option<usize>, Self::Error> {
+        match self {
+            WebTransportRecvStreamAny::Quinn(s) => s.read(dst).await.map_err(Into::into),
+            WebTransportRecvStreamAny::WebSocket(s) => s.read(dst).await.map_err(Into::into),
+        }
+    }
+
+    fn stop(&mut self, code: u32) {
+        match self {
+            WebTransportRecvStreamAny::Quinn(s) => s.stop(code).ok().unwrap_or_default(),
+            WebTransportRecvStreamAny::WebSocket(s) => s.stop(code),
+        }
+    }
+
+    async fn closed(&mut self) -> Result<(), Self::Error> {
+        match self {
+            WebTransportRecvStreamAny::Quinn(s) => s.closed().await.map_err(Into::into),
+            WebTransportRecvStreamAny::WebSocket(s) => s.closed().await.map_err(Into::into),
+        }
+    }
+}
+
+impl From<web_transport_quinn::RecvStream> for WebTransportRecvStreamAny {
+    fn from(stream: web_transport_quinn::RecvStream) -> Self {
+        WebTransportRecvStreamAny::Quinn(stream)
+    }
+}
+
+impl From<web_transport_ws::RecvStream> for WebTransportRecvStreamAny {
+    fn from(stream: web_transport_ws::RecvStream) -> Self {
+        WebTransportRecvStreamAny::WebSocket(stream)
+    }
+}
+
+impl web_transport_trait::Session for WebTransportSessionAny {
+    type SendStream = WebTransportSendStreamAny;
+    type RecvStream = WebTransportRecvStreamAny;
+    type Error = WebTransportErrorAny;
+
+    async fn accept_uni(&self) -> Result<Self::RecvStream, Self::Error> {
+        match self {
+            WebTransportSessionAny::Quinn(s) => {
+                s.accept_uni().await.map(Into::into).map_err(Into::into)
+            }
+            WebTransportSessionAny::WebSocket(s) => {
+                s.accept_uni().await.map(Into::into).map_err(Into::into)
+            }
+        }
+    }
+
+    async fn accept_bi(&self) -> Result<(Self::SendStream, Self::RecvStream), Self::Error> {
+        match self {
+            WebTransportSessionAny::Quinn(s) => s
+                .accept_bi()
+                .await
+                .map(|(send, recv)| (send.into(), recv.into()))
+                .map_err(Into::into),
+            WebTransportSessionAny::WebSocket(s) => s
+                .accept_bi()
+                .await
+                .map(|(send, recv)| (send.into(), recv.into()))
+                .map_err(Into::into),
+        }
+    }
+
+    async fn open_bi(&self) -> Result<(Self::SendStream, Self::RecvStream), Self::Error> {
+        match self {
+            WebTransportSessionAny::Quinn(s) => s
+                .open_bi()
+                .await
+                .map(|(send, recv)| (send.into(), recv.into()))
+                .map_err(Into::into),
+            WebTransportSessionAny::WebSocket(s) => s
+                .open_bi()
+                .await
+                .map(|(send, recv)| (send.into(), recv.into()))
+                .map_err(Into::into),
+        }
+    }
+
+    async fn open_uni(&self) -> Result<Self::SendStream, Self::Error> {
+        match self {
+            WebTransportSessionAny::Quinn(s) => {
+                s.open_uni().await.map(Into::into).map_err(Into::into)
+            }
+            WebTransportSessionAny::WebSocket(s) => {
+                s.open_uni().await.map(Into::into).map_err(Into::into)
+            }
+        }
+    }
+
+    fn send_datagram(&self, payload: bytes::Bytes) -> Result<(), Self::Error> {
+        match self {
+            WebTransportSessionAny::Quinn(s) => s.send_datagram(payload).map_err(Into::into),
+            WebTransportSessionAny::WebSocket(s) => s.send_datagram(payload).map_err(Into::into),
+        }
+    }
+
+    async fn recv_datagram(&self) -> Result<bytes::Bytes, Self::Error> {
+        match self {
+            WebTransportSessionAny::Quinn(s) => s.recv_datagram().await.map_err(Into::into),
+            WebTransportSessionAny::WebSocket(s) => s.recv_datagram().await.map_err(Into::into),
+        }
+    }
+
+    fn max_datagram_size(&self) -> usize {
+        match self {
+            WebTransportSessionAny::Quinn(s) => s.max_datagram_size(),
+            WebTransportSessionAny::WebSocket(s) => s.max_datagram_size(),
+        }
+    }
+
+    fn close(&self, code: u32, reason: &str) {
+        match self {
+            WebTransportSessionAny::Quinn(s) => {
+                web_transport_trait::Session::close(s, code, reason)
+            }
+            WebTransportSessionAny::WebSocket(s) => s.close(code, reason),
+        }
+    }
+
+    async fn closed(&self) -> Self::Error {
+        match self {
+            WebTransportSessionAny::Quinn(s) => s.closed().await.into(),
+            WebTransportSessionAny::WebSocket(s) => s.closed().await.into(),
+        }
+    }
+}
diff --git a/web-transport-ws/src/lib.rs b/web-transport-ws/src/lib.rs
index 8c59a84..d1cf0b5 100644
--- a/web-transport-ws/src/lib.rs
+++ b/web-transport-ws/src/lib.rs
@@ -3,10 +3,10 @@ mod frame;
 mod session;
 mod stream;
 
-pub(crate) use error::*;
 pub(crate) use frame::*;
 pub(crate) use stream::*;
 
+pub use error::*;
 pub use session::*;
 pub use tokio_tungstenite;
 pub use tokio_tungstenite::tungstenite;