Eva Bes Ostáriz (born 14 January 1973) is a former professional tennis player from Spain. She won a total of six singles and 29 doubles titles on the ITF Circuit during her career. On 4 March 2002, she reached a singles ranking high of world No. 90. On 22 May 2000, she peaked at No. 71 in the WTA doubles rankings. As a junior, Bes was the 1991 French Open girls' doubles champion. She retired from professional tennis in 2003.