NCAA Season 81
Host school	Colegio de San Juan de Letran
Tagline	One @ 81: Values Formation Through Sports
General
Seniors	Benilde Blazers
Juniors	San Sebastian Staglets
Seniors' champions
Sport Men Women Basketball  Letran N/A
Juniors' champions
Sport Boys Girls Basketball  San Sebastian N/A
(NT) = No tournament; (DS) = Demonstration Sport; (Ex) = Exhibition;

Octo-One, the mascot of the 81st season of the NCAA.

NCAA Season 81 was the 2005–06 season of the National Collegiate Athletic Association (Philippines). Colegio de San Juan de Letran was the season's host.

To usher in the new season, Letran and the other NCAA member schools performed the opening ceremonies at the Araneta Coliseum, followed by four basketball games on June 25, 2005. Other disciplines started their own tournaments within the following months, with beach volleyball as the last tournament on mid-March.

De La Salle-College of Saint Benilde won its first General Championship honors for the Seniors division, while the San Sebastian Recoletos High School won its second Juniors General Championship, via tiebreakers, when La Salle Green Hills emerged with an equal number of points.

Basketball

Seniors' tournament

Elimination round

Team standings progression in the senior's basketball tournament.

Pos	Team	W	L	PCT	GB	Qualification
1	Letran Knights (H)	13	1	.929	—	Twice-to-beat in the semifinals
2	PCU Dolphins	10	4	.714	3
3	Mapúa Cardinals	9	5	.643	4	Twice-to-win in the semifinals
4	San Sebastian Stags	7	7	.500	6
5	Perpetual Altas	6	8	.429	7
6	Benilde Blazers	5	9	.357	8
7	San Beda Red Lions	4	10	.286	9
8	JRU Heavy Bombers	2	12	.143	11

Source: ABS-CBN Sports
Rules for classification: 1) winning percentage; 2) if tied for top 4, one-game playoff; 3) head-to-head record; 4) head-to-head point differential; 5) overall point differential
(H) Hosts

Playoffs

	Semifinals (Nos. 1 & 2 have twice-to-beat advantage)					Finals (Best-of-three series)
	1	Letran	93
	4	San Sebastian	60
						1	Letran	74	78	62
						2	PCU	79	60	54
	2	PCU	76
	3	Mapúa	53

Individual awards

• Most Valuable Player: Ernie Jay Sagad (CSB)
• Rookie of the Year: Kelvin dela Peña (Mapua)

Juniors' tournament

Elimination round

Pos	Team	W	L	PCT	GB	Qualification
1	San Sebastian Staglets	11	1	.917	—	Twice-to-beat in the semifinals
2	San Beda Red Cubs	10	2	.833	1
3	PCU Baby Dolphins	7	5	.583[lower-alpha 1]	4	Twice-to-win in the semifinals
4	JRU Light Bombers	7	5	.583[lower-alpha 1]	4
5	La Salle Green Hills Greenies	5	7	.417	6
6	Perpetual Altalettes	2	10	.167	9
7	Letran Squires[lower-alpha 2] (H)	0	12	.000	11

Source: ABS-CBN Sports
Rules for classification: 1) winning percentage; 2) if tied for top 4, one-game playoff; 3) head-to-head record; 4) head-to-head point differential; 5) overall point differential
(H) Hosts
Notes:

1. 1 2 Third-seed playoff: PCU 96–90 JRU
2. ↑ All of Letran's wins were forfeited when a player was found to have played in a ligang labas game.

Playoffs

	Semifinals (Nos. 1 & 2 have twice-to-beat advantage)					Finals (Best-of-three series)
	1	San Sebastian	95
	4	JRU	82
						1	San Sebastian	83	81
						2	San Beda	76	69
	2	San Beda	80
	3	PCU	73

Individual awards

• Most Valuable Player: Allan Mangahas (PCU-Union)
• Rookie of the Year: Darell Green (Letran)

Other sports and General Championship

See also

• UAAP Season 68