2023–24 CSA 4-Day Series

The 2023–24 CSA 4-Day Series is a first-class cricket competition taking place in South Africa from 26 October 2023 to 3 March 2024. It was the 3rd edition of the post-franchise era and retained the two-division league format introduced the previous year. The competing teams in each division were different for the first time since the 2021–22 adoption of the provisional format, with KwaZulu-Natal Inland being promoted to Division 1 and Knights being relegated to Division 2 based on their performances across all formats in the previous two years. 2023–24 will be the first season to have promotion and relegation based on teams' performances across formats in just that one season.

The Division 2 teams of Limpopo and Mpumalanga were re-awarded first-class status in October 2022. Therefore, unlike the previous season, all matches played in the competition would have first-class status.