Isaac Henry Sedric Fontaine IV[1] (born April 16, 1975) is an American former professional basketball player.

Born in Sacramento, California, he played collegiately at Washington State University.

He played in the NBA for the Memphis Grizzlies during the 2001–02 season, playing six games.

The following season, in 2002–03, he played with the Mobile Revelers of the NBA Development League.

This biographical article relating to a United States basketball player, coach, or other figure born in the 1970s is a stub.