Donny Isaak (born June 10, 1969) is an American former professional tennis player.
Isaak, a native of Carroll, Iowa, played collegiate tennis for the University of Southern California. He was a member of USC's 1991 NCAA championship team, as well as an NCAA singles semi-finalist and All-American that year.
In the early 1990s he competed on the professional tour and reached a best singles world ranking of 288. He made a doubles main draw appearance at Indian Wells in 1991, partnering Swede David Ekerot.
ATP Challenger finals Doubles: 2 (0–2) ResultNo.DateTournamentSurfacePartnerOpponentsScoreLoss1.Azores, PortugalHard Peter Nyborg Henrik Holm Nicklas Utgren6–7, 6–7Loss2.Aptos, United StatesHard Michael Roberts Brian MacPhie Alex O'Brien2–6, 6–7
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