Bonus Fat is a compilation album by the American punk rock band the Descendents, released in 1985 through New Alliance Records.

It combines the band's 1979 debut single "Ride the Wild" / "It's a Hectic World" with their 1981 Fat EP and the track "Global Probing" from the 1981 New Alliance compilation Chunks.

The compilation's cover combines guitarist Frank Navetta's illustration for the Fat EP with a caricature of singer Milo Aukerman drawn by Jeff "Rat" Atkins.

Ned Raggett of Allmusic gave Bonus Fat three stars out of five and focused his comments on "Ride the Wild" and "It's a Hectic World", calling them "gentle, surf-inspired power pop more than anything else.

"[2][6] He noted that "It's a Hectic World" is "even more explicitly surfy in ways, but with a nervous, flat new wave edge to it as well — not quite Devo if they grew up on the coast, but there's something to that comparison.