Pirojpur Sadar () is an upazila of Pirojpur District in Barisal, Bangladesh.
Pirojpur Sadar is located at . It has a total area of 166.81 km<sup>2</sup>.
According to the 2022 Bangladeshi census, Pirojpur Sadar Upazila had 44,783 households and a population of 181,707. 8.71% of the population were under 5 years of age. Pirojpur Sadar had a literacy rate (age 7 and over) of 87.07%: 87.72% for males and 86.44% for females, and a sex ratio of 96.52 males for every 100 females. 77,255 (42.52%) lived in urban areas.
According to the 2011 Census of Bangladesh, Pirojpur Sadar Upazila had 38,017 households and a population of 163,470. 34,704 (21.23%) were under 10 years of age. Pirojpur Sadar had a literacy rate (age 7 and over) of 70.30%, compared to the national average of 51.8%, and a sex ratio of 1026 females per 1000 males. 60,056 (36.74%) lived in urban areas.
As of the 1991 Bangladesh census, Pirojpur Sadar has a population of 225,156. Males constitute 50.93% of the population, and females 49.07%. This Upazila's eighteen up population is 116,628. Pirojpur Sadar has an average literacy rate of 50.7% (7+ years) compared to the national average of 32.4% literate.
UNO: Md. Arif Murshed Mishu.
Pirojpur Sadar Upazila is divided into Pirojpur Municipality and seven union parishads: Durgapur, Kadamtala, Kalakhali, Shankorpasha, Shariktola, Sikder Mallik, and Tona. The union parishads are subdivided into 64 mauzas and 98 villages.
Pirojpur Municipality is subdivided into 9 wards and 30 mahallas.