diff --git a/library/std/src/sync/poison/mutex.rs b/library/std/src/sync/poison/mutex.rs
index 1c29c619edc3a..30325be685c32 100644
--- a/library/std/src/sync/poison/mutex.rs
+++ b/library/std/src/sync/poison/mutex.rs
@@ -608,6 +608,17 @@ impl<T: ?Sized> Mutex<T> {
         let data = self.data.get_mut();
         poison::map_result(self.poison.borrow(), |()| data)
     }
+
+    /// Returns a raw pointer to the underlying data.
+    ///
+    /// The returned pointer is always non-null and properly aligned, but it is
+    /// the user's responsibility to ensure that any reads and writes through it
+    /// are properly synchronized to avoid data races, and that it is not read
+    /// or written through after the mutex is dropped.
+    #[unstable(feature = "mutex_data_ptr", issue = "140368")]
+    pub fn data_ptr(&self) -> *mut T {
+        self.data.get()
+    }
 }
 
 #[stable(feature = "mutex_from", since = "1.24.0")]
diff --git a/library/std/src/sync/poison/rwlock.rs b/library/std/src/sync/poison/rwlock.rs
index 6976c0a64e23f..a060e2ea57a7b 100644
--- a/library/std/src/sync/poison/rwlock.rs
+++ b/library/std/src/sync/poison/rwlock.rs
@@ -634,6 +634,17 @@ impl<T: ?Sized> RwLock<T> {
         let data = self.data.get_mut();
         poison::map_result(self.poison.borrow(), |()| data)
     }
+
+    /// Returns a raw pointer to the underlying data.
+    ///
+    /// The returned pointer is always non-null and properly aligned, but it is
+    /// the user's responsibility to ensure that any reads and writes through it
+    /// are properly synchronized to avoid data races, and that it is not read
+    /// or written through after the lock is dropped.
+    #[unstable(feature = "rwlock_data_ptr", issue = "140368")]
+    pub fn data_ptr(&self) -> *mut T {
+        self.data.get()
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/std/src/sync/reentrant_lock.rs b/library/std/src/sync/reentrant_lock.rs
index 96a4cf12659cc..727252f03a24e 100644
--- a/library/std/src/sync/reentrant_lock.rs
+++ b/library/std/src/sync/reentrant_lock.rs
@@ -349,6 +349,17 @@ impl<T: ?Sized> ReentrantLock<T> {
         }
     }
 
+    /// Returns a raw pointer to the underlying data.
+    ///
+    /// The returned pointer is always non-null and properly aligned, but it is
+    /// the user's responsibility to ensure that any reads through it are
+    /// properly synchronized to avoid data races, and that it is not read
+    /// through after the lock is dropped.
+    #[unstable(feature = "reentrant_lock_data_ptr", issue = "140368")]
+    pub fn data_ptr(&self) -> *const T {
+        &raw const self.data
+    }
+
     unsafe fn increment_lock_count(&self) -> Option<()> {
         unsafe {
             *self.lock_count.get() = (*self.lock_count.get()).checked_add(1)?;