| Chittagong-12 | |
| Parl Name: | Jatiya Sangsad |
| District: | Chittagong District |
| Region Label: | Division |
| Region: | Chittagong Division |
| Electorate: | 285,966 (2018) |
| Year: | 1973 |
| Party Label: | Parliamentary Party |
| Party: | None |
| Members Label: | Member of Parliament |
| Members: | Vacant |
| Local Council Label: | Council area |
| Local Council: | Patiya Upazila |
| Blank1 Name: | Prev. Constituency |
| Blank1 Info: | Chittagong-11 (Constituency 288) |
| Blank2 Name: | Next Constituency |
| Blank2 Info: | Chittagong-13 (Constituency 290) |
Chittagong-12 is a constituency represented in the Jatiya Sangsad (National Parliament) of Bangladesh. Since 6 August 2024 the constituency is Vacant.
The constituency encompasses all but five union parishads of Patiya Upazila: Bara Uthan, Char Lakshya, Char Patharghata, Juldha, and Sikalbaha.
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. Thus Chittagong-12 covers the area previously covered by Chittagong-11. Previously Chittagong-12 encompassed Anowara Upazila and five union parishads of Patiya Upazila: Bara Uthan, Char Lakshya, Char Patharghata, Juldha, and Sikalbaha.
Akhtaruzzaman Chowdhury Babu died in November 2012. Saifuzzaman Chowdhury Javed of the Awami League was elected in a January 2013 by-election.