The 2025 Italian football summer transfer window ran from 1 July to 1 September 2025 (20:00). Clubs could also sign players from 1 to 10 June 2025, in a brand new transfer window created on the occasion of the 2025 FIFA Club World Cup. This list includes transfers featuring at least one club from either Serie A or Serie B that were completed after the end of the 2024–25 season and before the end of the summer 2025 window on 1 September. Some contracts were already signed and announced before the window opening.
Clubs could not register new players until the opening of the winter transfer window, unless players had been unattached before 1 September 2025.
Transfers All players and clubs without a flag are Italian.
Legend Those clubs in Italic indicate that the player already left the team on loan on this or the previous season or a new signing that immediately left the club.