| Sidi Ali District | |
| Native Name: | دائرة سيدي علي |
| Native Name Lang: | ar |
| Type: | District |
| Image Map1: | Algeria 27 Wilaya locator map-2009.svg |
| Map Caption1: | Map of Mostaganem Province highlighting Sidi Ali District |
| Subdivision Type: | Country |
| Subdivision Name: |  Algeria |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mostaganem |
| Seat Type: | District seat |
| Seat: | Sidi Ali |
| Unit Pref: | Metric |
| Population Total: | 49551 |
| Population As Of: | 1998 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +01 |
| Blank Name Sec1: | Municipalities |
| Blank Info Sec1: | 3 |
Sidi Ali is a district in Mostaganem Province, Algeria. It was named after its capital, Sidi Ali.
The district is further divided into 4 municipalities: