Phulchhari or Fulchhari () is an upazila of Gaibandha District in the Division of Rangpur, Bangladesh.
Phulchhari is located at . It has 40,489 households and total area 314.03 km<sup>2</sup>.
According to the 2022 Bangladeshi census, Fulchhari Upazila had 44,910 households and a population of 166,662. 11.45% of the population were under 5 years of age. Fulchhari had a literacy rate (age 7 and over) of 59.99%: 62.79% for males and 57.30% for females, and a sex ratio of 97.20 males for every 100 females. 25,102 (15.06%) lived in urban areas.
According to the 2011 Census of Bangladesh, Phulchhari Upazila had 40,489 households and a population of 165,334. 46,512 (28.13%) were under 10 years of age. Phulchhari had a literacy rate (age 7 and over) of 31.25%, compared to the national average of 51.8%, and a sex ratio of 1003 females per 1000 males. 6,401 (3.87%) lived in urban areas.
As of the 1991 Bangladesh census, Phulchhari has a population of 128845. Males constitute 50.82% of the population, and females 49.18%. This Upazila's eighteen up population is 54806. Phulchhari has an average literacy rate of 16.5% (7+ years), and the national average of 32.4% literate.
Phulchhari Upazila is divided into seven union parishads: Erendabari, Fazlupur, Phulchari, Gazaria, Kanchipara, Udakhali, and Uria. The union parishads are subdivided into 80 mauzas and 85 villages.