The blue grosbeak (Passerina caerulea), is a medium-sized North American passerine bird in the cardinal family Cardinalidae.

The blue grosbeak was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Loxia caerulea.

[3] Linnaeus based his own description on the "blew gross-beak" described and illustrated by Mark Catesby in his The Natural History of Carolina, Florida and the Bahama Islands.

[6] The species is therefore now placed with the North American buntings in Passerina, a genus that was introduced by the French ornithologist Louis Pierre Vieillot in 1816.

The blue grosbeak nests in a low tree or bush or a tangle of vegetation, usually about 1–2.5 m (3.3–8.2 ft) above ground, often at the edge of an open area.