NCAA Season 81 basketball tournaments
| Host school | Colegio de San Juan de Letran | |||||||||||||||
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| 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 | |||||||||||||||
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| 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 | |||||||||||||||
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. 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.