Gerlach Cornelis Joannes van Reenen (30 September 1818, in Amsterdam – 31 May 1893, in The Hague) was a Dutch politician.
He was Mayor of Amsterdam from 1850-1853 and later a member of the House of Representatives of the Netherlands for Amsterdam.
He served as Ministers of the Interior from 1853-1856.
He was president of the House of Representatives of the Netherlands in the period 23 September 1858 - 20 September 1869.
After being a minister he became a member of the Council of State serving as Vice-President from 1876-1893.
In 1876 he became Jonkheer.
After the passing of king William III, the heir, Wilhelmina, was underage, and he became chairman of the regency committee.