Braxton Key (born February 14, 1997) is an American professional basketball player for the San Diego Clippers of the NBA G League.

Under his childhood surname of Blackwell,[3] Key played three seasons with Christ Presbyterian Academy, leading the team to a state title in 2013 and winning TSSAA's Mr. Basketball award in 2014 and 2015.

[4] He then transferred to Oak Hill Academy for his senior year, where he played under his father's surname for the first time and led the team to a 45–1 record and national championship.

[7] In the 2018–19 season, Key won a national championship at Virginia, scoring six points, pulling down 10 rebounds and blocking one shot in the title game against Texas Tech.

[14] On March 2, he posted a season-high 19 points to go with five rebounds, two assists, two steals two blocks in a 120–92 win over the NBA G League Ignite.

[17] In 43 career NBA G League games, he averaged 14.8 points, 6.1 rebounds, 2.9 assists, 1.8 steals and 1.3 blocks in 23.7 minutes.

[22] On January 1, 2023, Key was re-acquired by the Delaware Blue Coats,[23] and eventually helped the team win the NBA G League title.