Chittagong-3 is a constituency represented in the Jatiya Sangsad, the national parliament of Bangladesh.
The constituency encompasses the entirety of Sandwip Upazila, including its main towns, villages, and surrounding rural areas, as well as the island of Urirchar, integrating both regions under a single administrative and electoral boundary.
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-3 encompassed Sitakunda Upazila and Chittagong City Corporation wards 9 and 10.
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