Lanai (; Hawaiian: or ) is the sixth-largest of the Hawaiian Islands and the smallest publicly accessible inhabited island in the chain. It is also known as Pineapple Island because of its past as an island-wide pineapple plantation. The island's only settlement of note is the small town of Lanai City. As of 2012, the island was 98% owned by Larry Ellison (Founder and Chairman of Oracle), with the remaining 2% owned by the state of Hawaii.

A lanai or lanai is a type of roofed, open-sided veranda, patio or porch originating in Hawaii. Many homes, apartment buildings, hotels and restaurants in Hawaii are built with one or more lanais.