Diamond Harbour Football Club was established in 2020 and approved by the
Indian Football Association (IFA) in 2022 to participate in the
Calcutta Football League (CFL) First Division, the third tier of the state league structure. Spanish coach Kibu Vicuña, previously associated with
Mohun Bagan and
Kerala Blasters, was appointed as the club’s first
head coach. In 2023, the Indian Football Association introduced a new format by merging the CFL Premier Divisions A and B into a single competition. DHFC was placed in Group I and qualified for the Super Six stage of the tournament. Later in the year, the club was nominated to represent West Bengal in the inaugural season of the
I-League 3, the new fourth tier in the Indian league system. In 2024, Diamond Harbour FC took part in the
Sikkim Gold Cup held in
Gangtok, reflecting its growing participation in national-level competitions. The club won the
I-League 2 and was promoted to the
I-League in the same year. Diamond Harbour made their
Durand Cup debut in 2025 where they reached the finals by beating
Indian Super League clubs,
Jamshedpur FC and
East Bengal FC. However, they lost the final 6-1 to
NorthEast United FC and finished runners up. ==Players==