Roger Philip Mason Jr. (born September 10, 1980) is an American retired professional basketball player who last played for the Miami Heat of the National Basketball Association (NBA). He is currently the deputy executive director of the NBA Players Association.

Mason lived in Silver Spring, Maryland where he attended primary school at Grace Episcopal Day School. He first attended high school at Sidwell Friends School where he was named MVP at the school as a freshman. He then transferred to Our Lady of Good Counsel High School for his sophomore, junior, and senior years. Mason led Good Counsel to their best basketball year ever, with 29 wins and a number 19 final ranking on the USA Today Super 25 list. At Good Counsel he scored a total of 1,426 points. He was named 1999 All-Metropolitan first team by The Washington Post, All-Washington Catholic Athletic Conference (WCAC), and all-county by the Montgomery Journal newspaper. He was also named 1999 Powerade "Mr. Basketball", awarded to the best player in the Washington, D.C. area.

Mason played collegiately at the University of Virginia (UVA). In 2001, he was named to the All-Atlantic Coast Conference (ACC) third team. Mason set a free throw percentage record in UVA history with 86.0 percent made and is currently third on the ACC's all-time list for free throw percentage.

Mason was selected with the 31st overall pick by the Chicago Bulls in the 2002 NBA draft after his junior year. On August 12, 2002, he signed a multi-year deal with the Bulls.

On December 15, 2003, he was traded to the Toronto Raptors for Rick Brunson. On December 16, 2004, he was waived by the Raptors.

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