Apple's desktop operating system, initially named Mac OS X and later OS X and then macOS, has had major annual releases since 2001. The following list presents the releases in chronological order by year of initial public release:
Year Version Release Name
2000 Public Beta Kodiak
2001 Mac OS X 10.0 Cheetah
2001 Mac OS X 10.1 Puma
2002 Mac OS X 10.2 Jaguar
2003 Mac OS X 10.3 Panther
2005 Mac OS X 10.4 Tiger
2007 Mac OS X 10.5 Leopard
2009 Mac OS X 10.6 Snow Leopard
2011 Mac OS X 10.7 Lion
2012 OS X 10.8 Mountain Lion
2013 OS X 10.9 Mavericks
2014 OS X 10.10 Yosemite
2015 OS X 10.11 El Capitan
2016 macOS 10.12 Sierra
2017 macOS 10.13 High Sierra
2018 macOS 10.14 Mojave
2019 macOS 10.15 Catalina
2020 macOS 11 Big Sur
2021 macOS 12 Monterey
2022 macOS 13 Ventura
2023 macOS 14 Sonoma
2024 macOS 15 Sequoia
2025 macOS 26 Tahoe (Preview)

---