The Terminator 2 star's partner Rachael Kneeland requested the order after he allegedly left her a number of threatening voicemails, according to the restraining order application seen by TMZ.
She was granted the order on Friday. Furlong cannot legally come between 100 yards of Kneeland and their 3-year-old son.
Furlong left profanity-laced voice messages and sent texts to Kneeland threatening to hurt her boyfriend and to cut her off financially, say court documents.
Kneeland plans to play the messages during an August 31 court date on the matter.