A 36-year-old homeless man lost part of his finger in a fight on the subway Sunday morning, according to police.

The brawl started on the southbound Q train around 4:30 a.m. and spilled out onto the platform at 7th Avenue and W. 49th Street, according to cops.

At one point, the other man bit the tip of the homeless man’s left index finger off and fled, police said.

The homeless man was taken to Bellevue Hospital for his injuries.