Michael Pitt‘s been ordered to stay away from his ex-girlfriend … this after he was arrested on sexual abuse charges.

Law enforcement sources tell TMZ … Pitt has been ordered by a New York judge to steer clear of his former partner for a year.

We’re told Pitt has to avoid her home, work or any place where she physically goes … and, he also can’t use electronic means — texts, calls, emails — to get in touch with her.

As you know … Pitt was arrested last week in connection with four alleged incidents prosecutors say went down between April 2020 and August 2021.

According to the indictment … Pitt allegedly sexually assaulted his then-girlfriend before, prosecutors say, he hit her with a wooden plank. They’re also claiming Pitt attacked his ex with a cinderblock on a different occasion.

The actor — best known for playing Jimmy Darmody on “Boardwalk Empire” — was charged with assault injury with a weapon sexually motivated, strangulation sexually motivated, sex abuse, and forcible compulsion. Pitt pled not guilty to all charges against him. He posted $100K bail and was released from custody.

Pitt’s lawyer Jason Goldman told us … “Unfortunately, we live in a world where somebody like Mr. Pitt — an accomplished professional who would never so much as contemplate these crimes — can be arrested on the uncorroborated word of an unhinged individual.