Donnelly is an Irish surname, coming from the Irish "O'Donnghaile" meaning male descendant of "Donnghal".

In the works of Harry Turtledove Donnelly may refer to:

Donnelly (Southern Victory), a U.S. soldier who develops a case of gonorrhea, minor character in Settling Accounts: In at the Death.
Donnelly (Worldwar), a U.S. soldier who is part of a bomb disposal unit, minor character in Worldwar: Upsetting the Balance.