Diego del Río (born 4 September 1972) is a former professional tennis player from Argentina.

[1] del Rio was a doubles specialist and appeared in the main draw of seven Grand Slam tournaments.

[2] The Argentine also competed in the mixed doubles in that event (partnering Laura Montalvo), as well as at that year's Wimbledon (with María Fernanda Landa), but fell at the first round in each.

[2] He was involved in a long deciding set in the 1999 Australian Open, which he and partner Mariano Puerta lost 13–15, to Brent Haygarth and T. J.

[2] He had also been a semi-finalist in Colombia two years earlier and made the semi-finals at the 1999 Merano Open.