Brian Joshua Cook (born December 4, 1980) is an American former professional basketball player who last played for Chiba Jets of the Japanese National Basketball League (NBL). He was drafted out of the University of Illinois with the 24th overall pick in the 2003 NBA draft by the Los Angeles Lakers.
In 2004, Cook was named to the University of Illinois All-Century Team.
Cook played high school basketball at Lincoln Community High School in central Illinois where he led the Railsplitters to the quarterfinals of the 1999 Illinois High School Association class AA state boys basketball tournament. Cook scored 38 points in 2 IHSA tournament finals games, averaging 19.0 points per game. He was named to the 1998 State Farm Holiday Classic all-tournament team and was a 1999 McDonald's All-American. He was also named the 1999 Illinois Mr. Basketball after averaging 21.7 points, 10.1 rebounds, 3.2 blocks, 2.0 steals and 1.8 assists per game as a senior. Cook was inducted into the Illinois Basketball Coaches Association Hall of Fame in 2016.