OSX may refer to:

• Mac OS X, an operating system family for Apple Macs and the iPhone
• OS-X, a priority based pre-emptive multitasking real-time embedded operating system
• DC/OSx, 1980s-era Unix operating system by Pyramid Technology
• OSX, the IATA code for Kosciusko-Attala County Airport in Kosciusko, Mississippi

See also

• Old Saxon, an early form of Low German used until the 12th century (ISO 639-3 language code)
• Oat-spelts xylan, a xylan-based poison

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