Ambernath United-Atlanta Football Club was an Indian professional football club created from a merger of Ambernath United FC and Atlanta FC. Based in Mumbai, Maharashtra, they competed in the MFA Elite Division. The club was promoted to the I-League 2. In 2023, Maharashtra Oranje FC took over Atlanta Football Club and earned the I-League 2 spot. Ambernath United FC joined hands with Bombay Muslims FC to form Ambernath United-Bombay Muslims FC that competed in the MFA Premier League.
Ambernath United Atlanta FC was created by a merger between Deepu K.'s Ambernath United and Allen Contractor's Atlanta FC in 2022. Atlanta FC Mumbai was playing in Elite Division before the merger, while Ambernath United was playing in local tournaments. Ambernath United Atlanta won the MFA Elite Division in their first year with a very dominant performance under coach Steven Dias, who was assistant coach of Odisha FC and interim coach of Jamshedpur FC, among others.
In 2022–23 I-League 2, the club moved to championship round. They achieved third place, and failed to secure I-League promotion.
In September 2023, Atlanta FC, which was 50% of Ambernath United Atlanta, was completely taken over by Oranje FC and renamed Maharashtra Oranje FC.
Ambernath United later formed a union with Bombay Muslims to participate in the 2023–24 Mumbai Premier League.