Jimmy Fallon treated 120 members of his “Tonight Show” staff — including house band The Roots — to burgers and booze last week.

Fallon and a phalanx of his late-night colleagues were seen at Bar 13 on East 13th Street — where a spy told Page Six he “took to the mike to graciously thank all the members of his team for their success.” (The show was nominated for six Emmys.)

To go with the celebratory booze, nearby Pop Burger sent over “hundreds of cheeseburgers and onion rings.”