It is located in the municipality of Alphen aan den Rijn, about 2 km east of the centre of Benthuizen.

Benthorn used to be a heerlijkheid (manor), owned by the States of Holland and West Friesland.

It was sold to Adam Adriaan van der Duyn, lord of 's Gravemoer, in 1724.

van der Aa, in 1840 Benthorn consisted of 0.85 square km and had 10 inhabitants in 2 houses.

[2] Part of the hamlet had to be demolished for the construction of the high speed railway HSL-Zuid, and only three farms remain.