Ansu Martin Sesay, Jr. (born July 29, 1976) is a former American professional basketball player.

Sesay attended Willowridge High School in Houston, Texas. He led his team to the school's first state title in basketball.

Sesay starred at University of Mississippi, where he was named first-team all-SEC during both his junior and senior seasons and was the SEC's player of the year during his senior year.

Sesay was selected 30th overall by the Dallas Mavericks in the 1998 NBA Draft. After the NBA's lockout ended, he tore his ACL during a condensed training camp and spent the entire 1999 season on the injured list. Apparently, there were some questions about Sesay's attitude in Dallas. Allegedly, the Mavericks were unhappy that he did not sit on the bench for games while injured and then failed to participate in the team's summer league program in 1999. He then spent the 1999-2000 season in the CBA, playing 54 games for Rockford, where he averaged nearly 12 points and five boards per game.

The Mavericks invited Sesay back to camp in 2000 but early in the preseason was dealt along with guard Dana Barros to Detroit for forward Loy Vaught. The next day, the Pistons released Sesay, and he returned to the CBA, playing 13 games for Quad City and finishing with averages of 10.5 points and 5.6 rebounds per game.