MenuetOS
| Screenshot | |
| Developer | Ville M. Turjanmaa | 
|---|---|
| Written in | FASM assembly language | 
| Working state | Beta | 
| Source model | Open source (32-bit) Closed source (64-bit) | 
| Initial release | May 16, 2000 (32-bit) | 
| Latest release | 32-bit: 0.86B / September 2, 2019 64-bit: 1.56.00 / April 4, 2025 | 
| Available in | English, Russian, Chinese, Czech, Serbian | 
| Platforms | IA-32, x86-64 | 
| Kernel type | Monolithic | 
| Default user interface | Graphical user interface by Yamen Nasr | 
| License | 32-bit: GPL-2.0-only 64-bit: Proprietary | 
| Official website | www.menuetos.net | 
MenuetOS is an operating system with a monolithic preemptive, real-time kernel written in FASM assembly language. The system also includes video drivers. It runs on 64-bit and 32-bit x86 architecture computers. Its author is Ville M. Turjanmaa. It has a graphical desktop, games, and networking abilities (TCP/IP stack). One distinctive feature is that it fits on one 1.44 MB floppy disk.