NCAA Season 81 basketball tournaments

NCAA Season 81

Host school	Colegio de San Juan de Letran
Men's Finals G1 G2 G3 Wins  Letran Knights 74 78 62 2  PCU Dolphins 79 60 54 1
Duration	September 19–23, 2005
Arena(s)	Araneta Coliseum
Finals MVP	Boyet Bautista
Winning coach	Louie Alas (3rd title)
Semifinalists	Mapúa Cardinals  San Sebastian Stags
TV network(s)	Studio 23 and TFC
Juniors' Finals G1 G2 Wins  San Sebastian Staglets 83 81 2  San Beda Red Cubs 76 69 0
Duration	September 19–21, 2005
Arena(s)	Araneta Coliseum
Finals MVP	Eric Salamat
Winning coach	Raymond Valenzona (1st title)
Semifinalists	PCU Baby Dolphins  JRU Light Bombers
TV network(s)	Studio 23 and TFC
< Season 80 2005 Season 82 >

The NCAA Season 81 basketball tournaments are tournaments of the Philippines' National Collegiate Athletic Association for basketball at the 2005–06 season. The tournaments are divided into two divisions: the Juniors tournament for male high school students, and the Seniors tournament for male college students.

Colegio de San Juan de Letran hosted the season, starting with an opening ceremony held at the Araneta Coliseum on June 25, 2005 followed by a double-header.^[1] Games in the elimination rounds and semifinals then are subsequently held at the Cuneta Astrodome, with the Finals played at the Araneta. Men's games are aired lived by ABS-CBN Sports via Studio 23.