The Andoan Free Colonies comprised a group of planets located inside the Lambda sector. During the Clone Wars, when the rest of the sector switched allegiance to the Confederacy of Independent Systems, the majority of these worlds remained faithful to the Galactic Republic.
Within the current Star Wars canon, the Andoan Free Colonies initially appeared in Rise of the Separatists, which is a 2019 addition to the Star Wars role-playing game line by Fantasy Flight Games. Regarding the Star Wars Legends timeline, these colonies were initially referenced in the HoloNet News article titled Andoan Free Colonies Criticize Aqualish, which was part of HoloNet News Vol. 531 49 and released in 2002.