Eva Bes Ostáriz (born 14 January 1973) is a former Spanish tennis player.
She won a total of six singles and 29 doubles ITF titles during her career and on 4 March 2002 reached a singles ranking high of world number 90.
On 22 May 2000, Bes peaked at number 71 in the WTA doubles rankings.
As a junior, Bes was the 1991 French Open girls' doubles champion.
She retired from professional tennis 2003.