Jashore Sadar (Bengali: যশোর সদর) is an upazila of Jashore District in the Division of Khulna, Bangladesh. Its administrative centre is the city of Jashore, which is also the centre of the district.

Jessore Sadar is located at 23°10′05″N 89°12′15″E / 23.1681°N 89.2042°E / 23.1681; 89.2042. It has 73,654 households and a total area of 435.40 km. The town of Jessore is on the banks of the Bhairab River. It is bordered by Jhenaidah district to the north, Bagherpara upazila and Narail district to the east, Abhaynagar and Manirampur upazilas to the south, and Jhikargachha and Chaugachha upazilas to the west.

As of the 2011 Census of Bangladesh, Jashore Sadar upazila had 169,164 households and a population of 742,898. 140,370 (18.89%) were under 10 years of age. Jashore Sadar had a literacy rate of 63.80%, compared to the national average of 51.8%, and a sex ratio of 953 females per 1000 males. 253,019 (34.06%) of the population lived in urban areas.

As of the 1991 Bangladesh census, Jessore Sadar had a population of 530,582. Males constitute 52.85% of the population, and females 47.15%. This Upazila's eighteen-up population was 281,108. Jessore Sadar has an average literacy rate of 44.2% (7+ years), against the national average of 32.4% literate. By the 2011 Bangladesh census, the upazila's population had grown to 742,898.

Jessore Sadar Upazila is divided into Jessore Municipality and 16 union parishads: Arabpur, Basundia, Chanchra, Churamankati, Diara, Fathehpur, Haibatpur, Ichhali, Kashimpur, Kachua, Lebutala, Narendrapur, Noapara, Ramnagar, Upashahar, and Jessore Cantonment. The union parishads are subdivided into 248 mauzas and 256 villages.

Jessore Municipality is subdivided into 9 wards and 75 mahallas.

It has one of the famous colleges of Bangladesh-Michael Modhushudon (MM) College.

• Upazilas of Bangladesh
• Districts of Bangladesh
• Divisions of Bangladesh