Montecristo is a small Italian islet located about halfway between Corsica and mainland Italy; south of Elba and west of Giglio . The island is remote and kept by the Italian government as a nature preserve and hunting park, and only accessible by private yacht and permit. There are no structures on the island, though the ruins of a 13th century monastery (destroyed by pirates in 1553) are visible.

The island is probably best-known as a fictional setting in Alexandre Dumas's novel The Count of Monte Cristo, but the actual island does not correspond closely to the description in the novel.

A montecristo is also a kind of sandwich; see Monte Cristo sandwich.

Montecristo is also the name of a Cuban cigar.