| Continent: | Asia U-18 |
| Year: | 1990 |
| Size: | 180 |
| Dates: | 25 August–2 September |
| Teams: | 16 |
| Federations: | 36 |
| Venues: | 1 |
| Cities: | 1 |
| Champions: | JPN |
| Title Number: | 1 |
| Prevseason: | 1989 |
| Nextseason: | 1992 |
The 1990 ABC Under-18 Championship was the eleventh edition of the Asian Championship for Junior Men. The tournament took place in Nagoya, Japan from August to 2 September 1990. Top three teams from this competition were qualified for the World Junior Basketball Championship held in Edmonton, Canada from July 26 to August 4 of 1991.
won their first-ever championship after breezing past in the championship match, 82-63. Defending champions, edged out the, 96-93 in the battle for third place.[1]
The top three teams represented Asia to the 1991 FIBA Under-19 World Championship.
Top two teams from each group advance to the final round. [2] [3]
| width=10px bgcolor="#ccffcc" | Qualified for the 1991 FIBA Under-19 World Championship |
| width=40 | Rank | width=180 | Team | width=60 | Record |
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