Cox's Bazar Sadar () is an upazila of Cox's Bazar District in the Division of Chittagong, Bangladesh.
Cox's Bazar Sadar is located at . It has 60,916 households and total area .
According to the 2022 Bangladeshi census, Coxs Bazar Sadar Upazila had 90,550 households and a population of 417,365. 11.17% of the population were under 5 years of age. Coxs Bazar Sadar had a literacy rate (age 7 and over) of 77.59%: 78.74% for males and 76.33% for females, and a sex ratio of 108.48 males for every 100 females. 331,355 (79.39%) lived in urban areas.
As of the 2011 Census of Bangladesh, Cox's Bazar Sadar upazila had a population of 417,365. Ethnic population was 4,048 (0.97%), of which the Rakhine were 3,494. At the 1991 Bangladesh census, Cox's Bazar Sadar had a population of 253,788, of whom 117,509 were aged 18 or older. Males constituted 53.94% of the population, and females 46.06%. Cox's Bazar Sadar had an average literacy rate of 28.3% (7+ years), against the national average of 32.4%.
In 1854, the Cox's Bazar police station and the Town Committee in 1959 were formed. In 1972, the town committee was demolished and turned into a municipality. In 1983, the thana was turned into an upazila.
Cox's Bazar Sadar Upazila is divided into Cox's Bazar Municipality and 10 union parishads: Chowfaldandi, Eidgaon, Islamabad, Islampur, Jalalabad, Jhilongjha, Khurushkhul, Pmkhali, Pokkhali and Varuakhali.<sup>https://sadar.coxsbazar.gov.bd/bn/site/page/fqwA-%E0%A6%87%E0%A6%89%E0%A6%A8%E0%A6%BF%E0%A7%9F%E0%A6%A8-%E0%A6%B8%E0%A6%AE%E0%A7%82%E0%A6%B9</sup> The union parishads are subdivided into 19 mauzas and 185 villages.https://sadar.coxsbazar.gov.bd/bn/site/page/1G3D-%E0%A6%8F%E0%A6%95-%E0%A6%A8%E0%A6%9C%E0%A6%B0%E0%A7%87-%E0%A6%95%E0%A6%95%E0%A7%8D%E0%A6%B8%E0%A6%AC%E0%A6%BE%E0%A6%9C%E0%A6%BE%E0%A6%B0-%E0%A6%B8%E0%A6%A6%E0%A6%B0
Cox's Bazar Municipality is subdivided into 12 wards and 97 mahallas.