Rainbow AC
| Full name | Aditya School of Sports Rainbow Athletic Club | ||
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| Short name | ASOS | ||
| Founded | 1956 | ||
| Ground | Amal Dutta Stadium, Dumdum | ||
| Capacity | 15,000 | ||
| Owner | Aditya Group | ||
| Head coach | Aditya Chatterjee | ||
| League | CFL Premier Division | ||
| Website | Official website | ||
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Rainbow Athletic Club (Bengali: রেইনবো অ্যাথলেটিক ক্লাব) is an Indian professional football club based in Kolkata, West Bengal, that competes in the Calcutta Premier Division.
The club was formerly known as Rainbow Athletic Club or simply Rainbow, and as NBP Rainbow Athletic Club due to sponsorship ties. In 2018, Rainbow AC participated in the I-League 2nd Division, the second tier of the Indian football league system. In 2020, the club was acquired by the Indian conglomerate Aditya Group, and officially renamed as Aditya School of Sports Rainbow Athletic Club, abbreviated as ASOS Rainbow AC.