Zajira (Bengali: জাজিরা) is an upazila of Shariatpur District in the Division of Dhaka, Bangladesh.

Zajira Upazila has a total area of 246.21 square kilometres (95.06 sq mi).

[1] About two-thirds is land and one-third is water, chiefly the Padma River, which flows through the northern part of the upazila.

Zajira had a literacy rate (age 7 and over) of 44.4%, compared to the national average of 51.8%, and a sex ratio of 1020 females per 1000 males.

[4] Zajira Upazila is divided into Zajira Municipality and 12 union parishads: Bara Gopalpur, Bara Krishnagar, Barakandi, Bilaspur, Zajira, Joynagor, Kunder Char, Mulna, Naodoba, Paler Char, Purba Naodoba, and Sener Char.