Ometepe is an island formed by two volcanoes rising out of Lake Nicaragua, located in the Rivas Department of the Republic of Nicaragua. Its name derives from the Nahuatl words ome (two) and tepetl (mountain), meaning "two mountains". It is the largest island in Lake Nicaragua.

The two volcanoes (Concepción and Maderas) are joined by a low isthmus to form one island. Ometepe has an area of 276 square kilometres (107 sq mi). It is 31 kilometres (19 mi) long and 5 to 10 kilometres (3.1 to 6.2 mi) wide. The island has an economy based on livestock, agriculture, and tourism. Plantains are the major crop.

The island first became inhabited during the Dinarte phase (c. 2000 BC – 500 BC), although evidence is questionable. The first known inhabitants were speakers of Macro-Chibchan languages. Traces of this past can still be found in petroglyphs and stone idols on the northern slopes of the Maderas volcano. The oldest date from 300 BC. Several centuries later, Chorotega and Nicarao people continued to add to the petroglyphs and created statues on Ometepe carved from basalt rock.