Márta Károlyi is a Hungarian-American gymnastics coach and the former national team coordinator for USA Gymnastics. She and her husband, Béla, are ethnic Hungarians from Transylvania, Romania, who trained athletes in Romania before defecting to the United States in 1981. Béla and Márta Károlyi have trained nine Olympic champions, fifteen world champions, sixteen European medalists and many U.S. national champions, including Mary Lou Retton, Betty Okino, Kerri Strug, Teodora Ungureanu, Phoebe Mills, Nadia Comăneci, Kim Zmeskal, and Dominique Moceanu.

Béla Károlyi is an ethnic Hungarian Romanian-American gymnastics coach. Early in his coaching career he developed the Romanian centralised training system for gymnastics. One of his earliest protégés was Nadia Comăneci, the first Olympic Games gymnast to be awarded a perfect score. Living under the dictatorship of Nicolae Ceaușescu, Károlyi frequently clashed with Romanian officials. He and his wife defected to the United States in 1981.