Joseph F. Onosai (born December 10, 1965) is a former strongman competitor and American football player.

In 1982 as a senior, he helped the Pac-Five football team win its first Interscholastic League of Honolulu and Prep Bowl championship (predecessor to the state tournament) and was named The Advertiser's ILH Offensive Player of the Year.

He received a scholarship to play for the University of Hawaiʻi at Mānoa, where he was converted into an offensive guard as a freshman.

The next year because of injuries on the offensive line, he also started at tackle and center, including a game against Long Beach State University where he played all three position.

Onosai was selected by the Dallas Cowboys in the sixth round (151st overall) of the 1987 NFL draft to play center.