An on-duty MTA bus driver was stabbed by an irate passenger in Queens late Wednesday, authorities said. 

The driver, a 54-year-old man, was operating a Q6 bus at Rockaway Boulevard and 150th Street in Jamaica around 10:30 p.m. when a male passenger flew into a rage and started arguing with him, cops said. 

The incident turned violent when the rider pulled out a “sharp object” and stabbed the driver twice in the left leg, cops said. 

The suspect — who cops say had a dark complexion and is about 5-foot-11, last seen wearing black cargo pants white sneakers — fled on foot in an unknown direction, authorities said. 

The driver was taken to Jamaica University Hospital Medical Center, where he is listed in stable condition. 

The MTA confirmed the location of the assault and the bus number, but referred further questions to police.

The incident comes weeks after career criminal Alexander Wright, 49, allegedly punched MTA employee Anthony Nelson, 35, in the head and threw him to the ground in the Bronx. 

Nelson, who was trying to stop the accused assailant from harassing straphangers, suffered injuries including a broken collarbone and dislocated nose.

During a Friday court appearance, Wright — who has 41 prior busts — was set to be sent back to Rikers Island on the same measly $5,000 bail a judge set during his arraignment.

During a press conference outside the courthouse, MTA Chair and CEO Janno Lieber said that upon conviction, the agency is going to urge the court to ban Wright from the subway system for three years — the maximum penalty available under the law. 

“Attacks on transit workers are unacceptable and we must do everything we can to prevent them and keep our customers and employees safe,” Lieber said. “Given the horrific actions of Mr. Wright and his long history of arrests — some of which were for similarly violent attacks — this penalty is warranted. Individuals who assault transit workers have no place on our subways, buses, and trains.”