diff --git a/crates/turborepo-auth/src/auth/login.rs b/crates/turborepo-auth/src/auth/login.rs
index fa4c966fb70cd..b6de5df21fe77 100644
--- a/crates/turborepo-auth/src/auth/login.rs
+++ b/crates/turborepo-auth/src/auth/login.rs
@@ -29,6 +29,7 @@ pub async fn login<T: Client + TokenClient + CacheClient>(
         existing_token,
         force,
         sso_team: _,
+        sso_login_callback_port,
     } = *options; // Deref or we get double references for each of these
 
     // I created a closure that gives back a closure since the `is_valid` checks do
@@ -83,7 +84,8 @@ pub async fn login<T: Client + TokenClient + CacheClient>(
         }
     }
 
-    let redirect_url = format!("http://{DEFAULT_HOST_NAME}:{DEFAULT_PORT}");
+    let port = sso_login_callback_port.unwrap_or(DEFAULT_PORT);
+    let redirect_url = format!("http://{DEFAULT_HOST_NAME}:{port}");
     let mut login_url = Url::parse(login_url_configuration)?;
     let mut success_url = login_url.clone();
     success_url
@@ -117,7 +119,7 @@ pub async fn login<T: Client + TokenClient + CacheClient>(
     let token_cell = Arc::new(OnceCell::new());
     login_server
         .run(
-            DEFAULT_PORT,
+            port,
             crate::LoginType::Basic {
                 success_redirect: success_url.to_string(),
             },
diff --git a/crates/turborepo-auth/src/auth/mod.rs b/crates/turborepo-auth/src/auth/mod.rs
index bac8ef2add74c..4005d9b0e9847 100644
--- a/crates/turborepo-auth/src/auth/mod.rs
+++ b/crates/turborepo-auth/src/auth/mod.rs
@@ -24,6 +24,7 @@ pub struct LoginOptions<'a, T: Client + TokenClient + CacheClient> {
     pub sso_team: Option<&'a str>,
     pub existing_token: Option<&'a str>,
     pub force: bool,
+    pub sso_login_callback_port: Option<u16>,
 }
 impl<'a, T: Client + TokenClient + CacheClient> LoginOptions<'a, T> {
     pub fn new(
@@ -40,6 +41,7 @@ impl<'a, T: Client + TokenClient + CacheClient> LoginOptions<'a, T> {
             sso_team: None,
             existing_token: None,
             force: false,
+            sso_login_callback_port: None,
         }
     }
 }
diff --git a/crates/turborepo-auth/src/auth/sso.rs b/crates/turborepo-auth/src/auth/sso.rs
index 2d3065e66cb8b..6e5205ee92d4b 100644
--- a/crates/turborepo-auth/src/auth/sso.rs
+++ b/crates/turborepo-auth/src/auth/sso.rs
@@ -35,6 +35,7 @@ pub async fn sso_login<T: Client + TokenClient + CacheClient>(
         sso_team,
         existing_token,
         force,
+        sso_login_callback_port,
     } = *options;
 
     let sso_team = sso_team.ok_or(Error::EmptySSOTeam)?;
@@ -90,7 +91,8 @@ pub async fn sso_login<T: Client + TokenClient + CacheClient>(
         }
     }
 
-    let redirect_url = format!("http://{DEFAULT_HOST_NAME}:{DEFAULT_PORT}");
+    let port = sso_login_callback_port.unwrap_or(DEFAULT_PORT);
+    let redirect_url = format!("http://{DEFAULT_HOST_NAME}:{port}");
     let mut login_url = Url::parse(login_url_configuration)?;
 
     login_url
@@ -117,7 +119,7 @@ pub async fn sso_login<T: Client + TokenClient + CacheClient>(
 
     let token_cell = Arc::new(OnceCell::new());
     login_server
-        .run(DEFAULT_PORT, crate::LoginType::SSO, token_cell.clone())
+        .run(port, crate::LoginType::SSO, token_cell.clone())
         .await?;
     spinner.finish_and_clear();
 
@@ -384,6 +386,7 @@ mod tests {
         };
         let mut options = LoginOptions {
             sso_team: Some(team),
+            sso_login_callback_port: None,
             ..LoginOptions::new(&color_config, &url, &api_client, &login_server)
         };
 
@@ -426,6 +429,7 @@ mod tests {
             existing_token: None,
             sso_team: None,
             force: false,
+            sso_login_callback_port: None,
         };
 
         let result = sso_login(&options).await;
@@ -450,6 +454,7 @@ mod tests {
             existing_token: Some("existing-token"),
             sso_team: Some("my-team"),
             force: false,
+            sso_login_callback_port: None,
         };
 
         let result = sso_login(&options).await.unwrap();
@@ -475,6 +480,7 @@ mod tests {
             existing_token: Some("existing-token"),
             sso_team: Some("my-team"),
             force: true,
+            sso_login_callback_port: None,
         };
 
         let result = sso_login(&options).await.unwrap();
diff --git a/crates/turborepo-lib/src/commands/login/manual.rs b/crates/turborepo-lib/src/commands/login/manual.rs
index e350921540ca6..0ce1cbf03b86d 100644
--- a/crates/turborepo-lib/src/commands/login/manual.rs
+++ b/crates/turborepo-lib/src/commands/login/manual.rs
@@ -189,6 +189,7 @@ mod test {
             upload_timeout: 0,
             login_url: "".into(),
             preflight: false,
+            sso_login_callback_port: None,
         };
         let login_opts = ManualLoginOptions::from(&api_opts);
         assert_eq!(
@@ -212,6 +213,7 @@ mod test {
             upload_timeout: 0,
             login_url: "".into(),
             preflight: false,
+            sso_login_callback_port: None,
         };
         let login_opts = ManualLoginOptions::from(&api_opts);
         assert_eq!(
diff --git a/crates/turborepo-lib/src/commands/login/mod.rs b/crates/turborepo-lib/src/commands/login/mod.rs
index feb6fce214243..cb24467c4fc9d 100644
--- a/crates/turborepo-lib/src/commands/login/mod.rs
+++ b/crates/turborepo-lib/src/commands/login/mod.rs
@@ -56,10 +56,12 @@ async fn sso_login(base: &mut CommandBase, sso_team: &str, force: bool) -> Resul
     let api_client: APIClient = base.api_client()?;
     let color_config = base.color_config;
     let login_url_config = base.opts.api_client_opts.login_url.to_string();
+    let sso_login_callback_port = base.opts.api_client_opts.sso_login_callback_port;
     let options = LoginOptions {
         existing_token: base.opts.api_client_opts.token.as_deref(),
         sso_team: Some(sso_team),
         force,
+        sso_login_callback_port,
         ..LoginOptions::new(
             &color_config,
             &login_url_config,
@@ -83,10 +85,12 @@ async fn login_no_sso(base: &mut CommandBase, force: bool) -> Result<(), Error>
     let color_config = base.color_config;
     let login_url_config = base.opts.api_client_opts.login_url.to_string();
     let existing_token = base.opts.api_client_opts.token.as_deref();
+    let sso_login_callback_port = base.opts.api_client_opts.sso_login_callback_port;
 
     let options = LoginOptions {
         existing_token,
         force,
+        sso_login_callback_port,
         ..LoginOptions::new(
             &color_config,
             &login_url_config,
diff --git a/crates/turborepo-lib/src/config/env.rs b/crates/turborepo-lib/src/config/env.rs
index c33fd42504a67..28afe8aba1909 100644
--- a/crates/turborepo-lib/src/config/env.rs
+++ b/crates/turborepo-lib/src/config/env.rs
@@ -45,6 +45,7 @@ const TURBO_MAPPING: &[(&str, &str)] = [
     ("turbo_tui_scrollback_length", "tui_scrollback_length"),
     ("turbo_concurrency", "concurrency"),
     ("turbo_no_update_notifier", "no_update_notifier"),
+    ("turbo_sso_login_callback_port", "sso_login_callback_port"),
 ]
 .as_slice();
 
@@ -212,6 +213,14 @@ impl ResolvedConfigurationOptions for EnvVars {
             .filter(|s| !s.is_empty())
             .cloned();
 
+        let sso_login_callback_port = self
+            .output_map
+            .get("sso_login_callback_port")
+            .filter(|s| !s.is_empty())
+            .map(|s| s.parse())
+            .transpose()
+            .map_err(Error::InvalidSsoLoginCallbackPort)?;
+
         let output = ConfigurationOptions {
             api_url: self.output_map.get("api_url").cloned(),
             login_url: self.output_map.get("login_url").cloned(),
@@ -245,6 +254,7 @@ impl ResolvedConfigurationOptions for EnvVars {
             cache_dir,
             root_turbo_json_path,
             log_order,
+            sso_login_callback_port,
         };
 
         Ok(output)
@@ -339,11 +349,13 @@ mod test {
         env.insert("turbo_remote_cache_upload_timeout".into(), "200".into());
         env.insert("turbo_tui_scrollback_length".into(), "2048".into());
         env.insert("turbo_concurrency".into(), "50%".into());
+        env.insert("turbo_sso_login_callback_port".into(), "3000".into());
 
         let config = EnvVars::new(&env)
             .unwrap()
             .get_configuration_options(&ConfigurationOptions::default())
             .unwrap();
+        assert_eq!(config.sso_login_callback_port(), Some(3000));
         assert!(config.preflight());
         assert!(config.force());
         assert_eq!(config.log_order(), LogOrder::Grouped);
@@ -393,6 +405,7 @@ mod test {
         env.insert("turbo_allow_no_turbo_json".into(), "".into());
         env.insert("turbo_tui_scrollback_length".into(), "".into());
         env.insert("turbo_concurrency".into(), "".into());
+        env.insert("turbo_sso_login_callback_port".into(), "".into());
 
         let config = EnvVars::new(&env)
             .unwrap()
@@ -421,5 +434,6 @@ mod test {
             DEFAULT_TUI_SCROLLBACK_LENGTH
         );
         assert_eq!(config.concurrency, None);
+        assert_eq!(config.sso_login_callback_port(), None);
     }
 }
diff --git a/crates/turborepo-lib/src/config/mod.rs b/crates/turborepo-lib/src/config/mod.rs
index b3a76c58b2eff..a05448adc7c74 100644
--- a/crates/turborepo-lib/src/config/mod.rs
+++ b/crates/turborepo-lib/src/config/mod.rs
@@ -240,6 +240,8 @@ pub enum Error {
          scrollback."
     )]
     InvalidTuiScrollbackLength(#[source] std::num::ParseIntError),
+    #[error("TURBO_SSO_LOGIN_CALLBACK_PORT: Invalid value. Use a number for the callback port.")]
+    InvalidSsoLoginCallbackPort(#[source] std::num::ParseIntError),
 }
 
 const DEFAULT_API_URL: &str = "https://vercel.com/api";
@@ -309,6 +311,7 @@ pub struct ConfigurationOptions {
     pub(crate) tui_scrollback_length: Option<u64>,
     pub(crate) concurrency: Option<String>,
     pub(crate) no_update_notifier: Option<bool>,
+    pub(crate) sso_login_callback_port: Option<u16>,
 }
 
 #[derive(Default)]
@@ -464,6 +467,10 @@ impl ConfigurationOptions {
     pub fn no_update_notifier(&self) -> bool {
         self.no_update_notifier.unwrap_or_default()
     }
+
+    pub fn sso_login_callback_port(&self) -> Option<u16> {
+        self.sso_login_callback_port
+    }
 }
 
 // Maps Some("") to None to emulate how Go handles empty strings
diff --git a/crates/turborepo-lib/src/opts.rs b/crates/turborepo-lib/src/opts.rs
index 10dffad49cef4..01a80ac250744 100644
--- a/crates/turborepo-lib/src/opts.rs
+++ b/crates/turborepo-lib/src/opts.rs
@@ -55,6 +55,7 @@ pub struct APIClientOpts {
     pub team_slug: Option<String>,
     pub login_url: String,
     pub preflight: bool,
+    pub sso_login_callback_port: Option<u16>,
 }
 
 #[derive(Debug, Clone, Serialize)]
@@ -449,6 +450,7 @@ impl<'a> From<OptsInputs<'a>> for APIClientOpts {
         let team_id = inputs.config.team_id().map(|s| s.to_string());
         let team_slug = inputs.config.team_slug().map(|s| s.to_string());
         let login_url = inputs.config.login_url().to_string();
+        let sso_login_callback_port = inputs.config.sso_login_callback_port();
 
         APIClientOpts {
             api_url,
@@ -459,6 +461,7 @@ impl<'a> From<OptsInputs<'a>> for APIClientOpts {
             team_slug,
             login_url,
             preflight,
+            sso_login_callback_port,
         }
     }
 }
@@ -737,6 +740,7 @@ mod test {
                 team_slug: None,
                 login_url: "".to_string(),
                 preflight: false,
+                sso_login_callback_port: None,
             },
             scope_opts,
             run_opts,
diff --git a/docs/site/content/docs/reference/system-environment-variables.mdx b/docs/site/content/docs/reference/system-environment-variables.mdx
index bbbf956ce2400..5bd57d28704eb 100644
--- a/docs/site/content/docs/reference/system-environment-variables.mdx
+++ b/docs/site/content/docs/reference/system-environment-variables.mdx
@@ -340,6 +340,15 @@ System environment variables are always overridden by flag values provided direc
         settings in run or watch mode.
       </td>
     </tr>
+    <tr id="turbo_sso_login_callback_port">
+      <td>
+        <code>TURBO_SSO_LOGIN_CALLBACK_PORT</code>
+      </td>
+      <td>
+        Override the default port (9789) used for the SSO login callback server
+        during authentication.
+      </td>
+    </tr>
   </tbody>
 </table>