The "Gaia Trilogy" refers to a series of three action role-playing games developed by Quintet. The trilogy includes the following games:
- Soul Blazer (1992)
- Illusion of Gaia (1993)
- Terranigma (1995)
These games are sometimes also referred to as the "Quintet Trilogy" or the "Heaven and Earth Trilogy" by fans. They are known for their strong storylines and gameplay, and are considered classic titles in the action RPG genre.