In August 1944 "Nicholson" joined the 3rd Fleet in the Marshalls. She screened fast carriers in raids on the Bonins, Formosa, and the Philippines, supporting the invasion of the Palaus and the neutralization of Yap. Returning to the Philippines, her group assisted the 7th Fleet during the invasion of Leyte and the decisive Battle for Leyte Gulf, from which "Nicholson" sailed for a Seattle overhaul.