Obadiah Richard Toppin Jr. (born March 4, 1998) is an American professional basketball player for the Indiana Pacers of National Basketball Association (NBA). A power forward, he played college basketball for the Dayton Flyers.

A native of New York City, Toppin was born in the borough of Brooklyn, and 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 his sophomore college season, Toppin declared for the 2020 NBA draft where he was selected with the eighth overall pick by the New York Knicks. Toppin was the winner of the 2022 NBA Slam Dunk Contest after being runner-up in the year prior.