Zach may refer to:
- As a surname
- Anton von Zach (1747-1826), Austrian general
- Erwin von Zach (1872-1942), Austrian diplomat and sinologist
- Franz Xaver von Zach (1754-1832), Austrian astronomer
- Alexander Zach (born 1976), Austrian politician
- František Zach (1807-1892), Czech-born soldier, military theorist and freedom fighter
- Hilde Zach (1942–2011), first woman mayor of Innsbruck, Austria
- Jan Zach (died 1773), Czech composer, violinist and organist
- Michal Zach (born 1969), Czech football manager
- Nathan Zach (born 1930), Israeli poet
- As a given name
- see Zechariah, which lists people named Zach
- In astronomy
- Zach (crater), on the Moon