Collector is the second Japanese-language studio album and third overall by South Korean girl group Itzy. It was released on October 8, 2025, by Warner Music Japan. The album features 10 tracks, including the lead single "Rock & Roll", and Japanese versions of the previously released singles "Imaginary Friend", "Girls Will Be Girls", and "Gold". It also features "Algorhythm" and "No Biggie" (2024) re-recorded as a quintet.