Ritter was born in Los Angeles, California, the son of Nancy Morgan and the late John Ritter, and the grandson of musician/actor Tex Ritter and Dorothy Fay. His stepmother is Amy Yasbeck. His siblings are Carly, Tyler, and Stella Ritter. Ritter is a graduate of New York University's Tisch School of the Arts, where he studied at the Atlantic Theatre Company. He also studied at the Royal Academy of Dramatic Art in London. Ritter has been dating Marianna Palka since 1999.

Ritter first made his debut The Dreamer of Oz, after nine years starring in his first TV series Days of Our Lives playing the character "Todd" in unknown episodes. three years after starring in the movie PG (2002); one year later starring in Swimfan. In 2003, Jason then starred in the Slasher/Horror film Freddy vs. Jason playing "Will Rollins." He also appeared in Raise Your Voice and Happy Endings.

Among his theater credits are Wendy Wasserstein's Third at Lincoln Center, for which he won the Clarence Derwent Award and the Martin E. Segal Award for his portrayal of the title character; the off-Broadway production of The Beginning of August, and the role of Tim in the world premiere of Neil LaBute's play The Distance From Here at London's Almeida Theatre.

Ritter has volunteered as an actor with the Young Storytellers Program. He will be staring as Jeb Bush in the upcoming Oliver Stone film W.

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