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- It's been at least 20 years. I used to eat burgers and steak, and I would just be knocked out afterward; I had to give it up. The first thing was dairy. I was about 24 years old and I had tons of acne and mucus. I met some random girl on a bus who told me to quit dairy and all those symptoms would go away three days later. By God she was right.
- Interview with Maxim magazine, explaining why he became vegan; as quoted in "Woody Harrelson’s Vegan Acne Cure", in HuffingtonPost.com (23 September 2009).
- Because superior non-animal methods are used for this exact training by military and civilian programs around the world, animals are clearly not required to meet your objectives. … I'm sure you agree that our military personnel deserve state-of-the-art training and that our country deserves to be respected for its civilized treatment of animals.
- Letter that he sent to the Army, against the use of monkeys in chemical attack training exercises; full text in "Woody Harrelson Fights Army Tests on Chimps", in Usnews.com (13 September 2011).