The actor narrates a new video expose of the meat and dairy industries, which he hopes will put fans off their food.
Introducing the Face Your Food film, the Emmy Award-winning actor says, "The images that you're about to see might make you want to turn away, but this is what you pay for every time you buy meat, eggs and dairy products.
"That's why tens of millions of kind people just in the United States alone have decided to leave animal products off their plates for good."
Dinklage became a vegetarian at the age of 16, and is now a vegan.
The short film debuts on Peta.org on Wednesday (16Apr14).