How can I find the macOS version codename? I want to find the codename of my version of OS X / macOS.
E.g. Lion, Leopard, Mavericks, etc.
If I click the Apple symbol, then &quot;About This Mac&quot;, I only get the version number.
Where can I find the Big Cat or California Location marketing codename?
The version number is the correct thing to report when you have issues. You should also include the subversion.
The marketing names are from macOS - Wikipedia article, up to and including macOS Catalina.
╔════════════════════════════╦════════════════════╗
║          Version           ║      Codename      ║
╠════════════════════════════╬════════════════════╣
║ Rhapsody Developer Release ║ Grail1Z4 / Titan1U ║
║ Mac OS X Server 1.0        ║ Hera               ║
║ Mac OS X Developer Preview ║                    ║
║ Public Beta                ║ Kodiak             ║
║ Mac OS X 10.0              ║ Cheetah            ║
║ Mac OS X 10.1              ║ Puma               ║
║ Mac OS X 10.2              ║ Jaguar             ║
║ Mac OS X 10.3              ║ Panther            ║
║ Mac OS X 10.4              ║ Tiger              ║
║ Mac OS X 10.5              ║ Leopard            ║
║ Mac OS X 10.6              ║ Snow Leopard       ║
║ Mac OS X 10.7              ║ Lion               ║
║ OS X 10.8                  ║ Mountain Lion      ║
║ OS X 10.9                  ║ Mavericks          ║
║ OS X 10.10                 ║ Yosemite           ║  
║ OS X 10.11                 ║ El Capitan         ║
║ macOS 10.12                ║ Sierra             ║  
║ macOS 10.13                ║ High Sierra        ║  
║ macOS 10.14                ║ Mojave             ║  
║ macOS 10.15                ║ Catalina           ║  
║ macOS 11.0                 ║ Big Sur            ║
╚════════════════════════════╩════════════════════╝