| Official Name: | Mymensingh Sadar |
| Native Name: | ময়মনসিংহ সদর |
| Settlement Type: | Upazila |
| Coordinates: | 24°N 90°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Type2: | District |
| Subdivision Name1: | Mymensingh |
| Subdivision Name2: | Mymensingh |
| Seat Type: | Headquarters |
| Seat: | Mymensingh |
| Area Total Km2: | 380.72 |
| Population Total: | 998,422 |
| Population As Of: | 2022 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Population Metro: | 576,927 |
| Postal Code Type: | Postal code |
| Postal Code: | 2200[2] |
| Area Code: | 091[3] |
| Timezone: | BST |
| Utc Offset: | +6 |
Mymensingh Sadar (bn|ময়মনসিংহ সদর) is an upazila of Mymensingh District in the Division of Mymensingh, Bangladesh. Most of the area of this sadar upazila is now under the Mymensingh City Corporation.[4]
Mymensingh Sadar is located at 24.75°N 90.4167°W. It has 167,472 units of household and its total area is 380.72 km2. The River Brahmaputra just crosses the section of Mymensingh.[5] A hundred plus years ago the river was widened 5–10 km and now it is a seasonal flow, not an ever-flowing river. A huge land recovered from this riverbed for a hundred years as named 'chars' is a big part of Mymensingh and as it was riverine land regular seasonal flood water namely from the Garo hills of Meghalaya Of India flashes up to these char's. Flood is some where seasonal reasons for refreshing fertility of land and a trend of native fishes add some protein budget assistance in this poor CHAR villages.
According to the 2011 Census of Bangladesh, Mymensingh Sadar Upazila had 167,472 households and a population of 775,733. 187,926 (24.23%) were under 10 years of age. Mymensingh Sadar has a literacy rate (age 7 and over) of 51.74%, compared to the national average of 51.8%, and a sex ratio of 983 females per 1000 males. 389,918 (48.85%) lived in urban areas. Muslims formed 93.83% of the population, Hindus 5.96%, Christians 0.17% and others 0.04%.[6] [7]
As of the 1991 Bangladesh census, Mymensingh Sadar had a population of 566,368. Males constituted 52.18% of the population, and females 47.82%. This Upazila's eighteen-up population was 284,112. Mymensingh Sadar has an average literacy rate of 37% (7+ years), and the national average of 32.4% literate.[8]
Mymensingh Sadar Upazila is divided into 13 union parishads: Aqua, Austadhar, Bhabkhali, Bororchar, Boyra, Char Ishwardia, Char Nilaxmia, Dapunia, Ghagra, Khagdohor, Kushtia, Paranganj, and Sirta. The union parishads are subdivided into 136 mauzas and 175 villages.[9]