Ethan Gregory Peck is an American actor. He is the grandson of actor Gregory Peck and Greta Kukkonen, the elder Peck's first wife. In 2019, he played a young Spock in Star Trek: Discovery, a role he has reprised for the television series Star Trek: Strange New Worlds.

Peck was born in Los Angeles, California, on March 2, 1986. He is the son of Stephen Peck, a former actor, documentary filmmaker, and Vietnam veteran who is president and CEO of U.S. Veterans Initiative, and abstract artist Francine Matarazzo. He is the grandson of actor Gregory Peck and his first wife, Finnish-born Greta Kukkonen. Peck attended private schools Campbell Hall and Harvard-Westlake in Studio City. He excelled in athletics and learned to play classical cello.