Eva Bes Ostáriz (born 14 January 1973) is a former professional tennis player from Spain.

Over her career, she won a total of 35 titles (29 in doubles) on the ITF Circuit.

On 4 March 2002, she reached a career-high singles ranking of world No.

As a junior, Bes was the 1991 French Open girls' doubles champion.

Coached by her brother, Pablo Bes, Eva's favorite surface has been clay; best shot is forehand.