Arin Sur is an Ungaran woman tied to the Green Lantern Corps. She is the sister of Abin Sur of Sector 2814 and lover of Sinestro of Korugar. They had a daughter together, who would become a Green Lantern herself: Soranik Natu.
Arin Sur was created by Geoff Johns and Doug Mahnke, first appearing in Green Lantern (Volume 4) #45 (2009).