diff --git a/crates/uv-workspace/src/workspace.rs b/crates/uv-workspace/src/workspace.rs
index 455bbb5a44523..06bd7f34e9b5a 100644
--- a/crates/uv-workspace/src/workspace.rs
+++ b/crates/uv-workspace/src/workspace.rs
@@ -201,6 +201,10 @@ impl Workspace {
         let path = std::path::absolute(path)
             .map_err(WorkspaceError::Normalize)?
             .clone();
+        // Remove `.` and `..`
+        let path = uv_fs::normalize_path(&path);
+        // Trim trailing slashes.
+        let path = path.components().collect::<PathBuf>();
 
         let project_path = path
             .ancestors()
@@ -1363,6 +1367,10 @@ impl ProjectWorkspace {
         let project_path = std::path::absolute(install_path)
             .map_err(WorkspaceError::Normalize)?
             .clone();
+        // Remove `.` and `..`
+        let project_path = uv_fs::normalize_path(&project_path);
+        // Trim trailing slashes.
+        let project_path = project_path.components().collect::<PathBuf>();
 
         // Check if workspaces are explicitly disabled for the project.
         if project_pyproject_toml
diff --git a/crates/uv/tests/it/build.rs b/crates/uv/tests/it/build.rs
index b18690b527ff1..6d55a5a01d431 100644
--- a/crates/uv/tests/it/build.rs
+++ b/crates/uv/tests/it/build.rs
@@ -2084,3 +2084,65 @@ fn venv_included_in_sdist() -> Result<()> {
 
     Ok(())
 }
+
+/// Ensure that workspace discovery works with and without trailing slash.
+///
+/// <https://github.com/astral-sh/uv/issues/13914>
+#[test]
+fn test_workspace_trailing_slash() {
+    let context = TestContext::new("3.12");
+
+    // Create a workspace with a root and a member.
+    context.init().arg("--lib").assert().success();
+    context.init().arg("--lib").arg("child").assert().success();
+
+    uv_snapshot!(context.filters(), context.build().arg("child"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Building source distribution (uv build backend)...
+    Building wheel from source distribution (uv build backend)...
+    Successfully built dist/child-0.1.0.tar.gz
+    Successfully built dist/child-0.1.0-py3-none-any.whl
+    ");
+
+    // Check that workspace discovery still works.
+    uv_snapshot!(context.filters(), context.build().arg("child/"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Building source distribution (uv build backend)...
+    Building wheel from source distribution (uv build backend)...
+    Successfully built dist/child-0.1.0.tar.gz
+    Successfully built dist/child-0.1.0-py3-none-any.whl
+    ");
+
+    // Check general normalization too.
+    uv_snapshot!(context.filters(), context.build().arg("./child/"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Building source distribution (uv build backend)...
+    Building wheel from source distribution (uv build backend)...
+    Successfully built dist/child-0.1.0.tar.gz
+    Successfully built dist/child-0.1.0-py3-none-any.whl
+    ");
+
+    uv_snapshot!(context.filters(), context.build().arg("./child/../child/"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Building source distribution (uv build backend)...
+    Building wheel from source distribution (uv build backend)...
+    Successfully built dist/child-0.1.0.tar.gz
+    Successfully built dist/child-0.1.0-py3-none-any.whl
+    ");
+}