Johnny Case (born June 28, 1989) is an American mixed martial artist and professional boxer who currently competes in the Lightweight division of RIZIN. A professional since 2007, he formerly competed in the Ultimate Fighting Championship, Professional Fighters League, and RFA.

Case was born and raised in Jefferson, Iowa. He began wrestling in kindergarten and continued through Jefferson-Scranton High School from where he graduated. He had a wrestling scholarship for college but opted to turn it down in pursuit of mixed martial arts career.

Case began competing professionally almost immediately, losing in the first round in his first two fights after just one amateur fight, a first-round win. He competed for various regional promotions across the Midwest for several years, compiling a record of 18–4 along the way, before signing with the UFC on the heels of an eight fight win streak in the spring of 2014.

Case was initially slated to make his UFC debut as a short-notice replacement for Francisco Treviño to face Joe Ellenberger on June 28, 2014, at UFC Fight Night 44. However, Case did not pass an eye exam and was replaced by James Moontasri.

Case eventually debuted against Kazuki Tokudome on September 20, 2014, at UFC Fight Night 52. Case won the fight via technical submission in the second round. The finish earned Case a Performance of the Night bonus.

Case was linked to a bout with Paul Felder on January 18, 2015, at UFC Fight Night 59. However, Felder elected to fight as a replacement against Danny Castillo at UFC 182 and was briefly replaced by Francisco Treviño. On December 23, it was announced that Treviño had to pull out of the bout due to an injury and was replaced by newcomer Frankie Perez. Case finished Perez via TKO in the third round.

Case faced Francisco Treviño on June 13, 2015, at UFC 188. He won the fight by unanimous decision.

As the first bout of his new five-fight contract, Case faced Yan Cabral on November 7, 2015, at UFC Fight Night 77. He won the fight by unanimous decision.