The giant kingbird (Tyrannus cubensis ) is a species of bird in the tyrant flycatcher family Tyrannidae. It is endemic to Cuba, although there are historical records of it on other islands. The species is probably mostly closely related to the loggerhead kingbird, which also occurs in Cuba as well as several other nearby Caribbean islands.

While this species has been reported in the past to average only 23 cm (9 in) long, this may be excessively conservative with the overall length being 23 to 26 cm (9.1 to 10.2 in). Although it is not the largest tyrant flycatcher, its body mass was reported is significantly higher than the next largest known kingbird, the thick-billed kingbird, with an average of 93.6 g (3.30 oz), sometimes scaling up to 108 g (3.8 oz), meaning it can be nearly as heavy as the largest tyrant flycatcher, the great shrike tyrant. The giant kingbird is found in tall lowland forest. In particular it favours pine forests and the wooded borders of waterways. It is also found in mixed pine barrens, open woodlands, swamps and savanna. It has also been seen in cloud forest.

It is threatened by habitat loss.