"Belle Grove" joined the massive amphibious force off Leyte on 20 October, ballasted down early that morning, and discharged her tank-loaded LCMs as part of the eighth assault wave. She then dispatched her boats to assist other ships in unloading cargo. The ship remained in Leyte Gulf until 22 October when, partly owing to the threat from Japanese surface forces, she departed the area. The dock landing ship reached Hollandia on the 27th and loaded supplies for a return trip to Leyte. Over the next month, she made four more supply runs shuttling from New Guinea to Leyte, before loading three tank landing craft at Sansapor for the invasion of Luzon. Underway 30 December, she joined Task Group 38.5 (TG 78.5) for the journey to Lingayen Gulf.