JC Mounduix (born Joseph Charles Monduy) is a Big Brother 20 (US) contestant. Mounduix was a skirt voter in the Level Six Alliance and a divisive houseguest. He was especially close with FOUTTE member Faysal Shafaat and Level Six member Tyler Crispen, and was able to manipulate several houseguests, especially Faysal. Mounduix said and did a lot of controversial things during the season, which drew the wrath of both the viewers and his fellow houseguests. His game started to fall apart in the final six, when he was nominated for the first time in the season and his ally Brett was caught off guard. Mounduix was nominated in the final five, but he avoided eviction. He won his first HoH title in the final four. When Level Six member Kaycee Clark cast the lone vote to evict him, he finished third and became the 9th and final member of the jury.

Mounduix and Rachel Swindler were co-hosts of After Buzz TV during the run of Big Brother 21 (US), where they discussed Big Brother and other reality shows. Mounduix, Kaycee Clark, and Tyler Crispen appeared on Big Brother 21 (US) as the BB20 Final 3 to discuss the BB21 Final 3. Mounduix was the last male houseguest to be nominated in Big Brother 20 (US), as well as the last houseguest overall. He received his first nomination on Day 86. Mounduix the fifth houseguest to make it past Day 78 without being elected, joining Derrick Levasseur, Austin Matelson, James Huling, and Nicole Franzel. Holly Allen and Tommy Bracco would follow him. Mounduix posts regularly on his YouTube channel, where he boasts over 7,000 subscribers.