Chittagong-13 is a constituency represented in the Jatiya Sangsad (National Parliament) of Bangladesh.

The constituency encompasses Karnaphuli Thana, Anwara Upazila, and five union parishads of Patiya Upazila: Bara Uthan, Char Lakshya, Char Patharghata, Juldha, and Sikalbaha.

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

[4] 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.

[5][2] Oli Ahmad stood for two seats in the June 1996 general election: Chittagong-13 and Chittagong-14.