Frag may refer to:
- Fragmentation grenade, in military, a type of hand grenade
- Fragging, assassination of an unpopular member of one's own fighting unit, occasionally using a fragmentation grenade
- Frag (video gaming), means to kill someone temporarily in computer games, originated from the military term
- Frag (game), a board game published by Steve Jackson Games, inspired from fragging in video games
- Fragmentation (reproduction), a form of asexual propagation in aquariums with coral
- Frag, a DC Comics character, and member of The Blasters
- Fragmentation (computing), a phenomenon in which storage space is used inefficiently in computer storage