Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic texture. Mineral assembly is composed typically of plagioclase, more than 20% of quartz and rare alkali feldspar. Amphiboles and pyroxenes are common accessory minerals.

Trondhjemite is a variety of tonalite where biotite is the only mafic mineral.

See also: igneous rocks, list of rocks