Frank W. Dux (pronounced "dukes"; born 1956) is an American martial artist and fight choreographer. Dux established his own school of Ninjutsu in 1975, called "Dux Ryu Ninjutsu".
He is also notable as the "inspiration" of the 1988 film Bloodsport starring Jean-Claude Van Damme.
Dux had been a controversial figure in martial arts, and the validity of many of his personal claims have been disputed.

Martial arts career

Dux states that he was introduced to and trained in Koga Yamabushi "Ninjitsu" by Senzo "Tiger" Tanaka, beginning at age 13. In the 1970s, Dux began teaching Dux Ryu Ninjitsu. He opened his first school in North Hollywood in 1980 while subsequent schools have been owned and operated by his students. Dux and his students have coached and produced a number of boxing and martial art regional, national, and world champions.

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