Obadiah Richard "Obi" Toppin Jr. (born March 4, 1998) is an American professional basketball player for the New York Knicks of the National Basketball Association (NBA). He played college basketball for the Dayton Flyers. Listed at 6 feet 9 inches (2.06 m) and 220 pounds (100 kg), he plays the power forward position.

A native of Brooklyn, Toppin graduated from Ossining High School in New York. After receiving no NCAA Division I offers, he played a postgraduate season at Mt. Zion Preparatory School in Maryland. As a freshman with the Dayton Flyers, Toppin was named Atlantic 10 Rookie of the Year after leading his team in scoring. He had breakout success in his sophomore season, earning Atlantic 10 Player of the Year and National College Player of the Year honors. After the college season Toppin declared for the 2020 NBA draft where he was selected with the eighth overall pick by the New York Knicks.