Zac is a masculine given name, often a short form (hypocorism) of Zachary or Zechariah. It may refer to:
People:
- Zac Alexander (born 1989), Australian professional squash player
- Zac Brooks (born 1993), American National Football League player
- Zac Brown (born 1978), lead singer and guitarist of the American country music band Zac Brown Band
- Zac Clarke (born 1990), Australian rules footballer
- Zac Curtis (born 1992), American Major League Baseball pitcher
- Zac Dalpe (born 1989), Canadian National Hockey League player
- Zac Dawson (born 1986), Australian rules footballer
- Zac Dysert (born 1990), American National Football League quarterback
- Zac Efron (born 1987), American actor and singer
- Zac Elkin (born 1991), South African cricketer
- Zac Evans (born 1991), Welsh footballer
- Zac Farro (born 1990), American musician
- Zac Goldsmith (born 1975), British Conservative politician and journalist
- Zac Guildford (born 1989), New Zealand rugby union player
- Zac Hanson (born 1985), American musician, best known as a member of the pop rock band Hanson
- Zac Henderson (1955–2020), American former National Football League and Canadian Football League player
- Zac Holtzman, American guitarist and co-founder of the band Dengue Fever
- Zac Kerin (born 1991), American National Football League player
- Zac Kristofak (born 1997), American baseball player
- Zac Lubin (born 1989), American soccer player
- Zac MacMath (born 1991), American soccer player
- Zac Morris (born 1978), English former cricketer
- Zac Posen (born 1980), American fashion designer
- Zac Rinaldo (born 1990), Canadian ice hockey player
- Zac Rosscup (born 1988), American Major League Baseball pitcher
- Zac Santo (born 1993), Australian rugby league footballer
- Zac Smith (born 1990), Australian rules footballer
- Zac Sunderland (born 1991), American sailor, first person under the age of 18 to sail solo around the world
- Zac Taylor (born 1983), American football coach and former quarterback
- Zac Williams (cyclist) (born 1995), New Zealand cyclist
- Zac Zorn (born 1947), American former swimmer
Fictional characters: