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. 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.
Coached by her brother, Pablo Bes, Eva's favorite surface has been clay; best shot is forehand. Father Rafael is a doctor; mother, MaPilar, is a housewife; Eva has three brothers, Rafael, Pablo and Jorge, two of whom are tennis coaches. She admired Gabriel Urpi, her first coach. Favorite tournament has been Roland Garros.