The Wea are a Miami-Illinois-speaking Native American tribe originally located in western Indiana, closely related to the Miami Tribe.

The name Wea is used today as the a shortened version of their numerous recorded names.

The Wea name for themselves (autonym) in their own language is waayaahtanwa, derived from waayaahtanonki, 'place of the whirlpool', their name where they are first recorded being seen and where they were living at that time.

The different spellings of their name are numerous, as they are made by different settlers from different language and educational backgrounds.

One French version is Ouiatenon; another Ouiateno; there are Wea villages, whose sites are now known as Lafayette and Terre Haute, Indiana, respectively.

In 2004 the Indiana Historical Bureau installa a marker commemorating the Wea Village in Terre Haute and its living descendants.

The Wea speak a dialect of Miami, the same language as the Miami Tribe, both from the Algonquian languages.