The thick-billed kingbird (Tyrannus crassirostris) is a large bird in the family Tyrannidae, the tyrant flycatchers.

This bird breeds from southeastern Arizona and extreme southwestern New Mexico in the United States and northern Sonora (the Madrean sky islands) through the western and western-coastal ranges in Mexico, south to western Guatemala.

[2][3] Adults are dusky olive-brown on the upperparts with light underparts; they have a long dark brown or black tail.

The bill on this species, for which it is named, is rather large and stocky compared to other members of this group and it is one of this kingbird's most distinguishing characteristics.

They wait on an open perch usually rather high or on top of the tree and fly out to catch insects in flight, (hawking).