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Mac OS X Lion is the eighth major release of Mac OS X , Apple's desktop and server operating system for Macintosh computers.

Mac OS X 10.7 Lion
A version of the Mac OS X operating system
OS X Lion icon.png
Mac OSX Lion screen.png
Screenshot of Mac OS X 10.7 Lion
Developer Apple Inc.
OS family
Source model Closed, with open source components
Released to
July 20, 2011; 5 years ago (2011-07-20)
Latest release 10.7.5 (Build 11G63) / October 4, 2012; 4 years ago (2012-10-04)
Update method Apple Software Update
Platforms x86-64
Kernel type Hybrid (XNU)
License Apple Public Source License (APSL) and Apple end-user license agreement (EULA)
Preceded by Mac OS X 10.6 Snow Leopard
Succeeded by Mac OS X 10.8 Mountain Lion
Official website Mac OS X 10.7 Lion at the Wayback Machine (archived June 9, 2012)
Support status
Unsupported as of about October 2014; iTunes support ended in September 2015

Mac OS X Lion (version 10.7; marketed as Mac OS X 10.7 Lion) is the eighth major release of Mac OS X (now named macOS), Apple's desktop and server operating system for Macintosh computers.

A preview of Mac OS X 10.7 Lion was publicly unveiled at the "Back to the Mac" Apple Special Event on October 20, 2010. It brings many developments made in Apple's iOS, such as an easily navigable display of installed applications, to the Mac, and includes support for the Mac App Store, as introduced in Mac OS X Snow Leopard version 10.6.6. On February 24, 2011, the first developer's preview of Lion (11A390) was released to subscribers to the Apple Developer program. Other developer previews were subsequently released, with Lion Preview 4 (11A480b) being released at WWDC 2011.

Lion was released to manufacturing on July 1, 2011, followed by its final release via the Mac App Store on July 20, 2011. Apple reported over one million Lion sales on the first day of its release. As of October 2011, Mac OS X Lion had sold over six million copies worldwide.