| Bay | |
| Other Name: | Bai |
| Nickname: | Baay |
| Settlement Type: | Region |
| Subdivision Type: | Country |
| Subdivision Name: |  Somalia |
| Subdivision Type1: | Regional State |
| Subdivision Name1: | South West |
| Seat Type: | Capital |
| Seat: | Baidoa |
| Leader Title: | Governor |
| Leader Name: | Ali Wardere Doyow[1] |
| Area Total Km2: | 35,156 |
| Population As Of: | 2019[2] |
| Population Total: | 1,560,900 |
| Population Density Km2: | auto |
| Timezone: | EAT |
| Utc Offset: | +3 |
| Coordinates: | 3.0744°N 43.8353°W |
| Blank Name Sec2: | HDI (2021) |
| Blank Info Sec2: | 0.294[3] · 15th of 18 |
| Official Name: | Bay |
Bay (so|Baay, ar|باي, it|Bai) is an administrative region (gobol) in southern Somalia.[4]
It is bordered by the Somali regions of Bakool, Hiran, Lower Shebelle (Shabeellaha Hoose), Middle Juba (Jubbada Dhexe), and Gedo.
Baidoa used to be the capital of the old Upper Juba region, which today also includes Gedo, Bakool, and most parts of the Middle Juba region. The present regions were created in the 1970s by the then ruling military regime. The capital of Bay is Baidoa.
During the Ethiopian invasion of Somalia in late December 2006, Bay region witnessed a series of fierce, concurrent battles lasting nine days between the invading Ethiopian military and the Islamic Courts Union.[5]
The region is mainly inhabited by the Rahanweyn people. According to the Population Estimation Survey (2014) (282), the division of population in the Bay region was as follows: 93,046 urban inhabitants, 463,330 rural settlers, 195,986 nomadic and 39,820 internally displaced persons (IDPs), making a total of 792,182.[6]
Bay Region consists of five districts:[7]