| QAtomicInt | Platform-independent atomic operations on integers |
| QAtomicPointer | Template class that provides platform-independent atomic operations on pointers |
| QFuture | Represents the result of an asynchronous computation |
| QFutureSynchronizer | Convenience class that simplifies QFuture synchronization |
| QFutureWatcher | Allows monitoring a QFuture using signals and slots |
| QMutex | Access serialization between threads |
| QMutexLocker | Convenience class that simplifies locking and unlocking mutexes |
| QReadLocker | Convenience class that simplifies locking and unlocking read-write locks for read access |
| QReadWriteLock | Read-write locking |
| QRunnable | The base class for all runnable objects |
| QSemaphore | General counting semaphore |
| QThread | Platform-independent threads |
| QThreadPool | Manages a collection of QThreads |
| QThreadStorage | Per-thread data storage |
| QWaitCondition | Condition variable for synchronizing threads |
| QWriteLocker | Convenience class that simplifies locking and unlocking read-write locks for write access |
| QtConcurrent | High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives |