Chaca may refer to:
Chaca is the only genus in the catfish family Chacidae. These fish are commonly known as squarehead catfishes, frogmouth catfishes, or angler catfishes. These unusual fish have a sedentary lifestyle and spend much of their time motionless.
The name Chaca is because, when removed from the water, they will rapidly repeat the sound "chaca". Only C. chaca makes these sounds; the other species do not.