Of course it is the well known Mohun Bagan AC based in kolkatta.
The oldest Football club in Asia was founded in India, the Mohun Bagan AC, in 1889.
Since its inception, the green and maroon club has earned the reputation of being one of the finest outfits in the country. In 1911, Mohun Bagan became the first Indian team to win a major tournament, when they clinched the IFA Shield by defeating the East Yorkshire Regiment.
In those pre-independence days, the historic win over an English team sparked off widespread jubilation and has since become a part of Indian football folklore.
In 1989, during the club`s centenary year, the Government of India issued a postage stamp to commemorate the 1911 victory of the team.
The Government honoured Mohun Bagan with the title the "National Club of India" for the spurt in nationalism created by that famous win.
Some of the major titles of the club are 3x National Football League, 11x Federation Cup, 21x IFA Shield, 16x Durand Cup, 26x Kolkata Super Division, Federation Cup (India), Rovers Cup, Durand Cup, IFA Shield and National & Domestic League to name a few.
Its arch rival is the East Bengal Club.
Mohun Bagan is coached by Biswajit Bhattacharya and is fondly known as Mariners