Pai Yun-yiao (Chinese: 白允瑤; pinyin: Bái Yǔnyáo; born 14 March 1969), also known as Elva Adams, is a Taiwanese taekwondo practitioner.

[1] After two years, she earned her black belt and soon started competing in international tournaments representing Chinese Taipei.

[1] In the early 1990s, Pai moved to the United States and attended University of Texas at San Antonio using the money she had earned from winning taekwondo competitions.

At the 2016 Summer Olympic Games in Rio de Janeiro, Brazil, she became the first female international referee from the United States to officiate taekwondo.

[3] In 2016, she won the silver medal for Woman's Team Over 30 at the World Taekwondo Poomsae Championships in Lima, Peru.