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NFL star Dante Fowler -- the 3rd pick in the '15 Draft -- played the role of referee as the mother of his child brawled with another woman at a FL apartment complex ... and TMZ Sports has the video.

It all went down on February 1st around 10 PM -- when 21-year-old Fowler arrived to the complex with a woman believed to be his girlfriend ... who confronted Fowler's baby mama in a common area in front of an elevator.

Fowler (a 6'3" 260 pound defensive end for the Jacksonville Jaguars) gets between the two women -- but instead of breaking it up ... he steps back and uses his arm to signal for the fight to begin.

What ensues is pure violence ... with the women wailing on each other as Fowler oversees the action.

Once Fowler decides he's seen enough, he grabs his baby mama and throws her off the other lady ... ending the fight.

He then hits the elevator button ... and leaves with the other woman.

We've reached out to everybody involved to find out what the hell happened ... so far, no one is talking.

We've also reached out to police who tell us they were not called to the scene, and no reports were filed.