diff --git a/library/std/src/sys/hermit/thread.rs b/library/std/src/sys/hermit/thread.rs
index 8be25f84999d..81b21fbbb165 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 cbb8ba964018..d745a6196140 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 133ad3ea420b..6fae31fa71e3 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 dc75d4ee6725..a8db251de201 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 9ec02bbec264..2e4e474c4492 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 a66ab0837570..16418a06226e 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 a5293133b3ab..75f70c2076ee 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 f44df845bf4d..b6b48208ac7b 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 c39a9b0ec023..e25f524ec056 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 251f099f28af..6732c6c61c20 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 ec23d4fe0dbd..04e20fdd41c0 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