Frag refers to the following:
- In the context of war, a frag is commonly known as an assassination of an unpopular member of one's own fighting unit, by dropping a fragmentation grenade into the victim's tent.
- A computer hard drive is said to be fragged (short for "fragmented") if a large portion of its files are not contiguous (those files are also fragmented). See fragmentation.
- In aquarium trade, particularly when reef aquarium is involved, a frag is a small fragment of a living coral separated from a larger colony for asexual propagation. Frags are frequently glued down to small pieces of substrate such as reef plugs for better display and easy placement in a reef tank. A coral colony is said to be "fragged" when it is completely broken into smaller fragments. A frag might not be representative of a shape of a mature colony.
It is also a pungent form of cheese made in Liverpool.