diff --git a/library/std/src/sys/hermit/thread.rs b/library/std/src/sys/hermit/thread.rs
index 8be25f84999..81b21fbbb16 100644
--- a/library/std/src/sys/hermit/thread.rs
+++ b/library/std/src/sys/hermit/thread.rs
@@ -97,7 +97,7 @@ impl Thread {
     }
 }
 
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     unsupported()
 }
 
diff --git a/library/std/src/sys/sgx/thread.rs b/library/std/src/sys/sgx/thread.rs
index cbb8ba96401..d745a619614 100644
--- a/library/std/src/sys/sgx/thread.rs
+++ b/library/std/src/sys/sgx/thread.rs
@@ -137,7 +137,7 @@ impl Thread {
     }
 }
 
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     unsupported()
 }
 
diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs
index 133ad3ea420..6fae31fa71e 100644
--- a/library/std/src/sys/unix/thread.rs
+++ b/library/std/src/sys/unix/thread.rs
@@ -263,7 +263,7 @@ impl Drop for Thread {
     }
 }
 
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     cfg_if::cfg_if! {
         if #[cfg(any(
             target_os = "android",
diff --git a/library/std/src/sys/unsupported/thread.rs b/library/std/src/sys/unsupported/thread.rs
index dc75d4ee672..a8db251de20 100644
--- a/library/std/src/sys/unsupported/thread.rs
+++ b/library/std/src/sys/unsupported/thread.rs
@@ -31,7 +31,7 @@ impl Thread {
     }
 }
 
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     unsupported()
 }
 
diff --git a/library/std/src/sys/wasi/thread.rs b/library/std/src/sys/wasi/thread.rs
index 9ec02bbec26..2e4e474c449 100644
--- a/library/std/src/sys/wasi/thread.rs
+++ b/library/std/src/sys/wasi/thread.rs
@@ -64,7 +64,7 @@ impl Thread {
     }
 }
 
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     unsupported()
 }
 
diff --git a/library/std/src/sys/wasm/atomics/thread.rs b/library/std/src/sys/wasm/atomics/thread.rs
index a66ab083757..16418a06226 100644
--- a/library/std/src/sys/wasm/atomics/thread.rs
+++ b/library/std/src/sys/wasm/atomics/thread.rs
@@ -40,7 +40,7 @@ impl Thread {
     pub fn join(self) {}
 }
 
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     unsupported()
 }
 
diff --git a/library/std/src/sys/windows/thread.rs b/library/std/src/sys/windows/thread.rs
index a5293133b3a..75f70c2076e 100644
--- a/library/std/src/sys/windows/thread.rs
+++ b/library/std/src/sys/windows/thread.rs
@@ -100,7 +100,7 @@ impl Thread {
     }
 }
 
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     let res = unsafe {
         let mut sysinfo: c::SYSTEM_INFO = crate::mem::zeroed();
         c::GetSystemInfo(&mut sysinfo);
diff --git a/library/std/src/thread/mod.rs b/library/std/src/thread/mod.rs
index f44df845bf4..b6b48208ac7 100644
--- a/library/std/src/thread/mod.rs
+++ b/library/std/src/thread/mod.rs
@@ -1455,12 +1455,12 @@ fn _assert_sync_and_send() {
 ///
 /// ```
 /// # #![allow(dead_code)]
-/// #![feature(available_concurrency)]
+/// #![feature(available_parallelism)]
 /// use std::thread;
 ///
-/// let count = thread::available_concurrency().map(|n| n.get()).unwrap_or(1);
+/// let count = thread::available_parallelism().map(|n| n.get()).unwrap_or(1);
 /// ```
-#[unstable(feature = "available_concurrency", issue = "74479")]
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
-    imp::available_concurrency()
+#[unstable(feature = "available_parallelism", issue = "74479")]
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
+    imp::available_parallelism()
 }
diff --git a/library/test/src/helpers/concurrency.rs b/library/test/src/helpers/concurrency.rs
index c39a9b0ec02..e25f524ec05 100644
--- a/library/test/src/helpers/concurrency.rs
+++ b/library/test/src/helpers/concurrency.rs
@@ -9,6 +9,6 @@ pub fn get_concurrency() -> usize {
             _ => panic!("RUST_TEST_THREADS is `{}`, should be a positive integer.", value),
         }
     } else {
-        thread::available_concurrency().map(|n| n.get()).unwrap_or(1)
+        thread::available_parallelism().map(|n| n.get()).unwrap_or(1)
     }
 }
diff --git a/library/test/src/lib.rs b/library/test/src/lib.rs
index 251f099f28a..6732c6c61c2 100644
--- a/library/test/src/lib.rs
+++ b/library/test/src/lib.rs
@@ -23,7 +23,7 @@
 #![feature(libc)]
 #![feature(rustc_private)]
 #![feature(nll)]
-#![feature(available_concurrency)]
+#![feature(available_parallelism)]
 #![feature(bench_black_box)]
 #![feature(internal_output_capture)]
 #![feature(panic_unwind)]
diff --git a/src/doc/rustc/src/tests/index.md b/src/doc/rustc/src/tests/index.md
index ec23d4fe0db..04e20fdd41c 100644
--- a/src/doc/rustc/src/tests/index.md
+++ b/src/doc/rustc/src/tests/index.md
@@ -161,7 +161,7 @@ The following options affect how tests are executed.
 
 Sets the number of threads to use for running tests in parallel. By default,
 uses the amount of concurrency available on the hardware as indicated by
-[`available_concurrency`].
+[`available_parallelism`].
 
 This can also be specified with the `RUST_TEST_THREADS` environment variable.
 
@@ -265,7 +265,7 @@ Experimental support for using custom test harnesses is available on the
 
 [`--test` option]: ../command-line-arguments.md#option-test
 [`-Z panic-abort-tests`]: https://github.com/rust-lang/rust/issues/67650
-[`available_concurrency`]: ../../std/thread/fn.available_concurrency.html
+[`available_parallelism`]: ../../std/thread/fn.available_parallelism.html
 [`cargo test`]: ../../cargo/commands/cargo-test.html
 [`libtest`]: ../../test/index.html
 [`main` function]: ../../reference/crates-and-source-files.html#main-functions