2025–26 CSA 4-Day Series
| Dates | 25 September 2025 – 22 February 2026 |
|---|---|
| Administrator | Cricket South Africa |
| Cricket format | First-class |
| Tournament format | Single round-robin |
| Champions | Div 1: Lions (5th title) Div 2: Knights (4th title) |
| Participants | 15 |
| Matches | 51 |
| Most runs | Div 1: Gavin Kaplan (903) Div 2: Gihahn Cloete (743) |
| Most wickets | Div 1: Matthew Boast (43) Div 2: Ernest Kemm (40) |
The 2025–26 CSA 4-Day Franchise Series was the 119th CSA 4-Day Domestic Series cricket season in South Africa. It was the fifth edition of the post-franchise era and retained the two-division league format introduced the previous year. As in 2024, Division One had eight teams and Division Two had seven teams. The competition was took place in South Africa from 25 September 2025 to 22 February 2026.