Gallia Academy High School (GAHS) is a public high school near Gallipolis at Centenary, Ohio, United States.

The original high school building was converted to a junior high school after construction of new facilities in the 1950s.

In 2005, the local community voted and approved a proposal to build a new campus on Centenary Road outside of downtown Gallipolis.

The current Gallia Academy High School was completed in 2009 and has been in use since August 24, 2009.

The Gallipolis Gallia Academy Blue Devils have been a part of the Ohio Valley Conference, since 2016-17.