Sir Laurence Nunns Guillemard GCMG KCB (7 June 1862 – 13 December 1951) was a British civil servant who served as high commissioner in Malaya when it was under the British Empire.
He was educated at Charterhouse School and Trinity College, Cambridge. Guillemard spent his early career in the civil service, where he was for several years Principal Private Secretary to Sir Michael Hicks Beach, Chancellor of the Exchequer. In May 1902, he was appointed Deputy-Chairman of the Board of Inland Revenue.
He was appointed Governor of the Straits Settlements and High Commissioner for the Federated Malay States in 1920, and was one of the promoters of British policies favouring the Malay ethnic group. He was invested as a Knight of the Order of the Bath (KCB) in 1910 and a Knight of the Order of St Michael and St George (KCMG) in 1923. He was promoted to Knight Grand Cross of the Order of St Michael and St George (GCMG) in the 1927 New Year Honours; he retired from the service in the same year.