The Monte Iberia eleuth, also known as the Monte Iberia dwarf frog, is a species of eleutherodactylid frog. It is critically endangered and endemic to rainforest in a small part of easternmost Cuba. It is the smallest frog in the Northern Hemisphere and the third smallest frog in the world, at about 10 mm (0.4 in) in snout–to–vent length.

The smallest organisms found on Earth can be determined according to various aspects of organism size, including volume, mass, height, length, or genome size.