Vehkalahti (Swedish: Veckelax) is a former municipality surrounding the town of Hamina in south-eastern Finland. At the beginning of 2003 Hamina and Vehkalahti combined to form a new town of Hamina.
These southern parts of Karelia is known to be the oldest parts of modern Finland with settlements. First markings of Vehkalahti as a continuous settlement or village are dated in 1336, when it has become a major place for east/west trading. The plans to build a town grew slowly as the place become crowded. In 1653 the area surrounding the village church officially became a town, which was called Vehkalahden Uusikaupunki (Swedish: Veckelax Nystad, English: Newtown of Vehkalahti).
While the area in the immediate vicinity of the church building became a town, the surrounding land remained countryside. Formerly the area of Vehkalahti was much larger, almost the entire Kymenlaakso, but later many areas became new municipalities. Largest population centers are Husula, Salmenkylä, Uusi-Summa, Poitsila and Neuvoton, there are also many rural villages like Metsäkylä, Reitkalli, Kannusjärvi and Pyhältö.