Frank Leo Mason III (born April 3, 1994) is an American professional basketball player for Leones de Ponce of the Baloncesto Superior Nacional (BSN).

[3] Mason was selected 34th overall in the 2017 NBA draft by the Sacramento Kings, where he spent two seasons before signing with the Milwaukee Bucks as a free agent in July 2019.

[5] Mason attended Massanutten Military Academy in Woodstock, Virginia to make up for the failing grade in government.

[8] During his junior season, Mason averaged 12.9 points and 4.6 assists and was named to the Big 12 All-Defensive Team.

[18] He played in the NBA Summer League for the Kings, where he scored 24 points in 24 minutes against the Los Angeles Lakers on July 10, 2017, adding 6 assists, 5 rebounds and 2 steals.

[39] On February 14, 2025, Mason signed with Leones de Ponce of the Baloncesto Superior Nacional (BSN).

[40] Mason and the Kansas Jayhawks competed on behalf of the United States in the 2015 World University Games.

[41] He scored 18 points in a double-overtime victory over Germany in the gold medal game and received the Finals MVP award.

[42] Mason grew up in the housing project of Pin Oak Estates located in Petersburg, Virginia, where he developed his game and earned the nickname "The Phenom" by local onlookers within the community.