The groove-billed ani (Crotophaga sulcirostris) is a tropical bird in the cuckoo family with a long tail and a large, curved beak.

The groove-billed ani was formally described by the English naturalist William Swainson from a specimen collected in Temascaltepec, Mexico.

It has a huge bill with lengthwise grooves running the length of the upper mandible.

It is very similar to the smooth-billed ani, some specimens of which have bills as small as the groove-billed and with grooves on the basal half.

In flight, the ani alternates between quick, choppy flaps and short glides.