Mainland is usually the continental part of a region, as opposed to the islands nearby. Sometimes the residents are called "the Mainlanders". As a result of the usually larger area of mainland, there are significantly more mainlanders than islanders, and mainlander culture and politics sometimes threaten to dominate those of the islands.

Prominent Mainlands include:

Occasionally two approximately equal sized islands may interchangely refer to each other as the Mainland, as in the North Island and South Island of New Zealand.