Aguigan (also known as
Aguihan, based on the Spanish rendition of the native name, "Aguijan", which is still often used as well) is a small bean-shaped
coralline island in the
Northern Mariana Islands chain in the
Pacific Ocean. It is situated southwest of
Tinian, from which it is separated by the
Tinian Channel. Aguigan and neighboring
Tinian Island together form
Tinian Municipality, one of the four main political divisions that comprise the Northern Marianas.