Ann Kiyomura-Hayashi (born August 22, 1955) is a former American professional tennis player. She is from San Mateo, California.
Kiyomura played on the WTA Tour from 1973 to 1984. She played in 11 US Opens, reaching the fourth round in 1978. In 1973, she won the Wimbledon junior singles title, beating Martina Navratilova. In 1975, she won the Wimbledon women's doubles title, playing with Kazuko Sawamatsu. She reached the final of the Australian Open women's doubles in 1980.