Gosairhat (Bengali: গোসাইরহাট) is an upazila of Shariatpur District in the Division of Dhaka, in south central Bangladesh.

Gosairhat Upazila has a total area of 196.72 square kilometres (75.95 sq mi).

Gosairhat had a literacy rate (age 7 and over) of 42.1%, compared to the national average of 51.8%, and a sex ratio of 1072 females per 1000 males.

[8] Gosairhat Upazila is divided into eight union parishads: Alawalpur, Goshairhat, Idilpur, Kodalpur, Kuchaipatti, Nager Para, Nalmuri, and Samantasar.

Nahim Razzak of the Bangladesh Awami League was elected Member of Parliament in a 2012 by-election in which he was unopposed.