| Sio | |
| Settlement Type: | Commune |
| Pushpin Map: | Mali |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Mali |
| Subdivision Type: | Country |
| Subdivision Name: |  Mali |
| Subdivision Type1: | Region |
| Subdivision Name1: | Mopti Region |
| Subdivision Type2: | Cercle |
| Subdivision Name2: | Mopti Cercle |
| Area Footnotes: | [1] |
| Area Total Km2: | 521 |
| Population As Of: | 2009 census |
| Population Footnotes: | [2] |
| Population Total: | 23948 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Utc Offset: | +0 |
| Coordinates: | 14.4058°N -4.0828°W |
Sio is a commune in the Cercle of Mopti in the Mopti Region of Mali.
The commune contains 19 villages and in 2009 had a population of 23,948. The main village is Soufouroulaye.