Keiko Nagatomi (born 22 November 1974) is a Japanese former professional tennis player.
Nagatomi, who had a highest singles ranking of 271, won four ITF titles and had her best WTA Tour performance at the 1999 Tashkent Open, where she made the second round. As a doubles player, she won a further 12 ITF titles and featured in the qualifying draw for the 1997 Wimbledon Championships.