Chittagong-12 is a constituency represented in the Jatiya Sangsad (National Parliament) of Bangladesh.

[2] The constituency was created for the first general elections in newly independent Bangladesh, held in 1973.

Ahead of the 2014 general election, the Election Commission renumbered the seat for Sandwip Upazila from Chittagong-16 to Chittagong-3, bumping up by one the suffix of the former constituency of that name and the higher numbered constituencies in the district.

Previously Chittagong-12 encompassed Anowara Upazila and five union parishads of Patiya Upazila: Bara Uthan, Char Lakshya, Char Patharghata, Juldha, and Sikalbaha.

[10] Saifuzzaman Chowdhury Javed of the Awami League was elected in a January 2013 by-election.