Vulsini, also known as Volsini volcano, Vulsini Volcanic District, Vulsini Volcanic Complex and the Vulsinian District, is a circular region of intrusive igneous rock in Lazio, Italy, about 87 km (54 mi) to the north northwest of Rome, containing a cluster of calderas known to have been active in recent geologic times.

A comagmatic province is a geologic area of the same type and age igneous rock deriving from the same crustal magma.

Italian routes SS74 and SS312 follow the rim from Valentano through Latera westward, turning off before Mezzano on the other side.

Two islands in the lake, Bisentina and Martana, were formed from airfall tuffs in Pompeii-like eruptions.

Dozens of other tuff cones dot the region, mainly on the eastern side of the complex.