- There's no excuse to be bored. Sad, yes. Angry, yes. Depressed, yes. Crazy, yes. But there's no excuse for boredom, ever.
- Quoted by Alex Kuczynski, Vanity Fair, "Finding Viggo" (January 1, 2004)
- You have a moral obligation to finish the job you said you would do.
- Quoted by Allison Glock, GQ, "Twenty-one Reasons to Dig Viggo Mortensen" (November 1, 2003)
- Adapt and overcome.
- Described as being written at his mirror, on additional DVD materials for "Lord Of The Rings: Fellowship Of The Ring".
- A lot of people can forget about you in Los Angeles.
- On why more American actors don't take roles in foreign-language films as he does, The New York Times, "Bilingualism Steps Into a Leading Role" (March 31, 2013)