Darnell Marcus Lamar Fizer (born August 10, 1978) is an American former professional basketball player.

Tim Floyd left Iowa State to coach the Chicago Bulls of the NBA after Fizer's freshman year and was replaced by Larry Eustachy.

His debut game was played on October 31, 2000, in a 81 - 100 loss to the Sacramento Kings where he recorded 16 points and 4 rebounds in 24 minutes off the bench.

[5] He appeared in 289 career NBA games, making 35 starts and averaging 9.6 ppg, 4.6 rpg and 1.2 apg, shooting .435 from the floor and .691 from the free throw line in 20.9 mpg.

Fizer played for the gold medal-winning United States team at the 2001 Goodwill Games in Brisbane, Australia while averaging 4.8 points and 3.0 rebounds, shooting .550 from the floor.

In the summer of 2006 he signed a one-year contract with Polaris World Murcia of the Spanish league ACB.

Then he played with Capitanes de Arecibo, in the Puerto Rico professional basketball league (BSN).

In the 2007–2008 season the Israeli Super League club reached the Euroleague championship game, eventually losing to CSKA Moscow.

Fizer was unable to play in the later stages of the Euroleague due to a knee injury that led to the termination of his contract with Maccabi just before the 2008–2009 season started.