Gerard Jacob Theodoor Beelaerts van Blokland (12 January 1843 – 14 March 1897) was a Dutch politician known for serving as European envoy for the South African Republic from 1884 to 1897, and as Speaker of the House of Representatives from 1888 to 1891.

The Beelaerts van Blokland family were orthodox Protestants and maintained a long-standing interest in South Africa.

He served as legal adviser to the Boer delegation to London to review the Pretoria Convention of 1883.

He also served as commissaire général of the South African delegation at the 1894 World Exhibition in Antwerp.

Archives relating to Beelaerts are located in the Nationaal Archief in The Hague and the Zuid-Afrikahuis in Amsterdam.