Elizabeth O'Neill may refer to:
Elizabeth O'Neill (official) (died 2007), Australian public servant and diplomat Elizabeth O'Neill (actress) (1791–1872), Irish actress Elizabeth O'Neill Verner (1883–1979), American artist Elizabeth O'Neill Verner House, house named in her honor Elizabeth O'Neil, American computer scientist Elizabeth O'Neill, a fictional character from Teenage Mutant Ninja Turtles