The 2025 County Championship, known for sponsorship reasons as the Rothesay County Championship 2025, was the 125th cricket County Championship season in England and Wales. As in 2024, Division One had ten teams and Division Two had eight teams. The season began on 4 April and ended on 27 September 2025. Surrey were the defending champions. Nottinghamshire won the title for the seventh time in the club's history and the first since 2010.
The teams were split based on the finishing positions in the 2024 season. The following teams took part in the County Championship:
Team promoted from Division Two in 2024
Team relegated from Division One in 2024