Tekirdağ is a city located in northwestern Turkey within the region of East Thrace. It serves as the seat of both Tekirdağ Province and the Süleymanpaşa District. The city is situated on the north coast of the Sea of Marmara.
The urban area of the city constitutes the primary part of the Süleymanpaşa district. As of 2022, the population of Tekirdağ was recorded at 186,421.