Sandefjordsfjorden or sometimes simply Sandefjorden,[1][2] is a 9-kilometre (5.6 mi) long fjord in Sandefjord Municipality in Vestfold county, Norway.

It is located west of the mainland, south of the town of Sandefjord, and east of the Vesterøya peninsula.

It is a wide fjord which gradually shrinks northbound towards the city harbor.

It has a number of small islands located in the fjord including Granholmen.

Its name derives from the name Sandar which, originally, was that of the farm just outside the present town centre, and which for hundreds of years was the vicarage of the parish of Sandeherred (Sandar), also known as Sande – hence the Sande-fjord.