The Greek goddess of revenge is Nemesis, who is also sometimes called Adrasteia. Depending on the source, Nemesis was the daughter of Zeus, the daughter of Oceanus, or a result of the pairing of Nyx and Erebus.
Nemesis is the goddess of fate, divine retribution and justice. She is balanced by Tykhe, the goddess of good fortune, and is often viewed as one who brings balance when a mortal or god has been too generously blessed.
The Erinyes, more commonly known as the Furies, are sometimes also associated with revenge, but they are more concerned with divine punishment for terrible crimes such as matricide. Nemesis, on the other hand, is better understood as a goddess who brings vengeance on behalf of those who have been wronged.