Yukio Tani (谷 幸雄 Tani Yukio, 1881 – 24 January 1950) was a pioneering Japanese jujutsu and judo instructor and professional challenge wrestler, notable for being one of the very first jujutsu stylists to teach and compete outside of Japan.
The precise details of Tani's early jujutsu training in Japan are unclear, but he is known to have studied at the Fusen-ryu dojo, as Yukio's father and grandfather were friends with Fusen-ryu master Mataemon Tanabe. He also trained in Yataro Handa's jujutsu school in Osaka. In 1900, the nineteen-year old Yukio, his brother Kaneo and a fellow jujutsuka Seizo Yamamoto travelled to London by invitation of Edward William Barton-Wright, the founder of Bartitsu. His brother and Yamamoto soon returned to Japan, but Yukio stayed in London and began appearing at music halls, giving demonstrations of jujutsu and placing challenges to all comers. Tani and Uyenishi were also employed as jujutsu instructors at Barton Wright's "Bartitsu School of Arms and Physical Culture" at 67b Shaftesbury Avenue in London's Soho district.
After breaking with Barton-Wright in 1903, Tani joined forces with veteran show business promoter William Bankier, who had himself been a music hall performer under the name "Apollo, the Scottish Hercules" and had met Yukio in his tenure with Barton. Under Bankier's management, Tani became a professional wrestler on the Music Hall circuit, where he would challenge anyone willing to test his skill. With the temptation of winning £1 for lasting each minute, for a bout of up to 5 minutes, or £5 to £100 for winning, there was never a shortage of challengers. On stage Tani was known as the "pocket Hercules" and was famous throughout all levels of London society. At 5 feet 6 inches (1.68 metres) Tani allegedly lost only one music hall match and that was to a fellow Japanese national, Taro Miyake in 1905. During one week at the Oxford Music Hall, Yukio Tani met and defeated thirty-three men, some of whom were well known continental wrestlers. In one six-month tour Tani defeated an average of 20 men a week, a total of over 500 challengers over the period of the tour.