MzScheme is an implementation of the Scheme programming language for Windows (95 and up), Mac OS X (10.3 and up), and Unix. The name is pronounced "miz scheme", as in "Ms. Scheme".

MzScheme is R⁵RS-compliant, including the full numerical tower. It also provides threads (on all platforms), exceptions, modules, class-based objects, Unicode, regular-expression matching, TCP/IP, and more.

MzScheme compiles Scheme to byte code. At run time on x86, x86_64, and PowerPC platforms, MzScheme converts byte code to native code through a just-in-time compiler. Alternately, on all platforms, the mzc compiler produces native code via C to run in MzScheme.

MzScheme supports access to foreign functions and libraries directly from Scheme, as well as MzScheme-specific extensions that are implemented in C/C++. MzScheme can also be embedded as an extension language within a C/C++ application. Interoperability with C/C++ is facilitated by the use of a conservative garbage collector.

System Requirements: Windows (95 and up), Mac OS X (10.3 and up), Unix, or standard x86 hardware. The latest version of MzScheme is useful given at least 5 MB of RAM, and installing requires roughly 20 MB of disk space.