The short, simple song of the Scrub Nightjar is given most often at dusk and dawn (Robbins et al. 1994, Cleere 1998). The song is a short treeow (Robbins et al. 1994) or keeLEEoo (Lane, in Schulenberg et al. 2007), that is about 0.25 sec long and consists of two notes. The song is repeated at 1-2 sec intervals, and is sung from the ground and low perches (Robbins et al. 1994, Cleere 1998, Ridgely and Greenfield 2001b).
Another call is described as a rolling quaqrrr that rises in pitch at the start of the call and rises again in the middle of the call; this vocalization is given from a perch, such as from a low fork in a bush (Cleere 1998).
The flight call is described as a soft tuk tuk tuk (Cleere 1998).