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 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 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:

• Zac MacGuire in the Australian soap opera Home and Away
• Zac Smith (Shortland Street) in the New Zealand soap opera Shortland Street
• Zac (Battlestar Galactica) in the original Battlestar Galactica TV series
• Zac (Shimmer and Shine), in the TV series Shimmer and Shine
• Zac, the Secret Weapon, a playable character in multiplayer online battle arena video game League of Legends