| Sport | Rugby Union |
|---|---|
| Instituted | 2010 |
| Number of teams | 8 |
| Country |  England |
| Holders | Holbrook (1st title) (2016–17) (promoted to Sussex 3) |
| Website | www.sussexrugby.co.uk |
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Sussex 4 is an English level 12 rugby union league traditionally divided into two regional divisions. It is run by the Sussex Rugby Football Union and features teams from this county. Teams play home and away matches from September to April. Promoted teams move up to Sussex Oranjeboom Division 3 and there is no relegation. The division has changed format several times in its history, originally being a regional division before changing to a single division and then back to a regional for the 2016-17 season.