| Host school | Perpetual Help College of Rizal | ||||||||||||
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| Duration | October 7–10, 1990 | ||||||||||||
| Arena(s) | Rizal Memorial Coliseum | ||||||||||||
| Winning coach | Joel Banal | ||||||||||||
| Juniors' tournament | |||||||||||||
| Champions |  Letran Squires | ||||||||||||
| First runner-up |  San Beda Red Cubs | ||||||||||||
| Winning coach | Mollet Pineda | ||||||||||||
The 1990 NCAA basketball tournament was the 66th season in the Philippine National Collegiate Athletic Association (NCAA). The season started on August 5 at the Ninoy Aquino Stadium and ended with the Mapua Cardinals breaking the 16-year cycle and won the seniors crown, dethroning the defending champion San Sebastian Stags.