| Diakhao Arrondissement | |
| Native Name: | Jaxaaw |
| Settlement Type: | Arrondissement |
| Mapsize: | 380px |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Subdivision Type: | Country |
| Subdivision Name: |  Senegal |
| Subdivision Type1: | Region |
| Subdivision Name1: | Fatick Region |
| Subdivision Type2: | Department |
| Subdivision Name2: | Fatick Department |
| Unit Pref: | Imperial |
| Population As Of: | 2005 est. |
| Population Blank1 Title: | Ethnicities |
| Timezone: | GMT |
| Utc Offset: | ±00:00 |
Diakhao Arrondissement (Serer proper : Jaxaaw[1]) is an arrondissement of the Fatick Department in the Fatick Region of Senegal. Its capital is Diakhao.
The arrondissement is divided administratively into rural communities and in turn into villages.
See also: Serer history (medieval era to present) and Kingdom of Sine. Diakhao is over-run by the Serer people. It was once part of the pre-colonial Kingdom of Sine. Diakhao holds great prominence in Serer medieval history because many of the Maad a Sinigs (title for the king of Sine) were crowned at Diakhao, at least from 1350 during the reign of Maad a Sinig Maysa Wali Jaxateh Manneh[2] to 1969, the year the last Serer king of Sine — Maad a Sinig Mahecor Joof died. As well as being the main capital of Sine, it was also the historical residence of many of the kings of Sine. Maad a Sinig Mahecor Joof died in Diakhao on 3 August 1969.[3]