Justin was born and raised in Washington, D.C, the son of Phyllis (Grissim), a writer for The Washington Post, and Eugene Theroux, a corporate lawyer. He is a nephew of writer Paul Theroux and a cousin of journalists Louis Theroux and Marcel Theroux. His father is of French-Canadian and Italian descent, and his mother has English and German ancestry. Theroux graduated from Bennington College with a bachelor of arts degree. He then moved to New York to pursue a career in the visual arts, but soon found himself immersed in stage acting. He starred in numerous off Broadway plays before his feature film career began. Justin's film career includes work both in front of and behind the camera as writer, director & actor. He has written on several high-profile films such as Iron Man 2, Tropic Thunder, and Rock of Ages. He lives in Los Angeles with his wife, Jennifer Aniston.

Jennifer Aniston (5 August 2015 - present) (separated)

Trivia

Nephew of Paul Theroux, author of many travel books.
Cousins are Marcel Theroux, a writer and Louis Theroux, the actor, writer and journalist who makes television programmes for the BBC.
Appears in the "Mafia" episode of the Comedy Central show Upright Citizens Brigade (1998). He is filmed talking to one of the actors during a hidden camera skit that was filmed in a dog park in New York City. Have be seen wearing the same black glasses he wore in Mulholland Drive (2001).
Has a younger brother, Sebastian, born in 1989
Academy Award-nominee (documentaries) Rachel Grady and her friend, Brooke Jones, took Justin Theroux to his first prom in Washington, D.C. and Justin's journalist mother, Phyllis Theroux, reported on their date in the June 5, 1985 New York Times.

It's like, once you've seen Tom Hanks win the Golden Globes, the Oscars, you've seen his wife, what kind of car he drives, when you watch his movies, you can't fully get really lost in them.
I watched the movie Cast Away (2000). It's a perfectly fine movie. But you can never fully believe that movie. How can we believe this man is being cast away? We know it's Tom Hanks and we know the color of his couch in his house in L.A. because we saw a picture of it in People magazine. His celebrity has corrupted his art form.
All the stuff with the World Trade Organization, the kids in Seattle throwing a bricks through Starbucks windows - I see it as a good thing. It's saying, like "F--k you." As long as no one's killing one another, I don't think there's anything wrong with throwing a brick through the window of McDonalds. I'm sort of inspired when I see people thinking like that.
If I was roped into a seven-year TV contract I'd probably hang myself. It's a TV show - selling cars, cereal, soda pop. TV is like that. The shows are incidental to the commercials. I always laugh when TV shows pat themselves on the back for being cutting-edge. I mean, an interracial kiss on Ally McBeal (1997) is cutting-edge? I've never been shocked by anything on television, except the news.