| Les Cayes Arrondissement | |
| Native Name: | Awondisman Les Cayes |
| Native Name Lang: | ht |
| Settlement Type: | Arrondissement |
| Subdivision Type: | Country |
| Subdivision Type1: | Department |
| Subdivision Name1: | Sud |
| Area Total Km2: | 873.49 |
| Area Urban Km2: | 22.62 |
| Area Rural Km2: | 850.87 |
| Population Total: | 346276 |
| Population As Of: | 2015 |
| Population Density Km2: | auto |
| Population Urban: | 105697 |
| Population Rural: | 240579 |
| Postal Code Type: | Postal code |
| Postal Code: | HT81 - |
| Utc Offset1: | -5 |
| Timezone1: | Eastern |
| Blank Name Sec1: | Communes |
| Blank Info Sec1: | 6 |
| Blank1 Name Sec1: | Communal Sections |
| Blank1 Info Sec1: | 20 |
| Blank Name Sec2: | IHSI Code |
| Blank Info Sec2: | 071 |
Les Cayes, often referred to as Aux Cayes (Haitian; Haitian Creole: Nan cays yo) is an arrondissement in the Sud department of Haiti. As of 2015, the population was 346,276 inhabitants.[1] Postal codes in the Les Cayes Arrondissement start with the number 81.
The arondissement consists of the following municipalities: