Hvitsten is a former town in Akershus county, Norway, located between Drøbak and Son.
It is the smallest town that has ever existed in Norway: In 1951 it had 76 inhabitants, and an area of just 0.07 km2. Due its size it could not be established as a municipality of its own, and it had to be a part of the rural municipality of Vestby. Hvitsten lost its status as a town January 1, 1964.
The town was named after the old farm Hvitsten (Norse Hvítisteinn), since it was built on its ground. The first element is hvítr 'white', the last element is steinn m 'stone, rock'.