Denise Kielholtz (born March 30, 1989) is a Dutch female Muay Thai fighter and mixed martial artist, based in Amsterdam, Netherlands. She has competed professionally since 2004 and is the current Bellator Kickboxing Flyweight champion. Kielholtz made her professional MMA debut at Torarica Summer Fights 1 in October, 2015. She lost the fight via submission. Denise signed with Bellator in 2016, appearing in the promotion's inaugural kickboxing card, Bellator Kickboxing 1 in Torino, Italy on April 16, 2016. She would go 4-1 in kickboxing for the promotion, earning the flyweight championship along the way. Kielholtz then made her Bellator MMA debut at Bellator 188 against Jessica Middleton. She won the fight via submission. She was expected to face Lena Ovchynnikova in the co-main event of Bellator 196 in Budapest, Hungary on April 6, 2018. However, Ovchynnikova pulled out of the fight and was replaced by Petra Částková. Kielholtz won the fight by unanimous decision. Kielholtz faced Veta Arteaga on September 21, 2018 at Bellator 205. She lost the fight via a submission. She then faced Bryony Tyrell at Bellator 223 on June 22, 2019. She won the fight via TKO in the third round. Kielholtz faced Sabriye Şengül at Bellator London 2 on November 23, 2019. She won the fight via an Americana submission in the first round. Kielholtz faced Kristina Williams at Bellator 239 on February 21, 2020. She won the fight via a rear-naked choke submission in the first round. Denise Kielholtz is married to kickboxer Hesdy Gerges.