Katt Williams has been arrested again ... TMZ has learned -- this time, the comedian was busted in Palmdale, CA after an intense standoff with a tractor driver.
Law enforcement sources tell TMZ ... a man doing tractor work on a Palmdale home where Katt was staying claims three women approached his vehicle and began attacking him with rocks and dirt clods around 4:30 Saturday afternoon.
The man, who says he suffered facial injuries in the attack, called his wife to pick him up -- but when she arrived, Katt pulled up in an SUV and blocked their exit. That's when the man called 911.
The L.A. County Sheriff's Dept. quickly arrived to the scene -- arrested the women for assault with a deadly weapon and busted Katt for felony intimidating a witness.
Katt was hauled to a nearby station, where he was booked. Bail was set at $50,000. Williams was released later that night.
Story developing ...