Jonathan Kimble Simmons is an American actor. Considered one of the most eminent male character actors of his generation, he has appeared in over 200 film and television roles. He is the recipient of various Supporting Actor accolades for his performance as the music instructor Terence Fletcher in Damien Chazelle's Whiplash (2014), including an Academy Award, a British Academy Film Award, a Screen Actors Guild Award, and a Golden Globe Award.

Whiplash is a 2014 American psychological drama film written and directed by Damien Chazelle, starring Miles Teller, J. K. Simmons, Paul Reiser, and Melissa Benoist. It focuses on an ambitious music student and aspiring jazz drummer (Teller), who is pushed to his limit by his abusive instructor (Simmons) at the fictional Shaffer Conservatory in New York City.