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.

Guillemard was the only son of Rev. William Guillemard. He was educated at Charterhouse School and Trinity College, Cambridge.^[2][4]

Guillemard entered the civil service in 1886^[5] and joined the Treasury in 1888^[6] where he was a Private Secretary to both Chancellors of the Exchequer, Sir William Harcourt and Sir Michael Hicks Beach between 1892 and 1902.^[2] In May 1902, he was appointed Deputy-Chairman of the Board of Inland Revenue and Chairman of the Board of Customs in 1908.^[2]

He was appointed Governor of the Straits Settlements and High Commissioner for the Federated Malay States in 1920^[7] and retired from the civil service in 1927.^[8]

Guillemard was invested as a Companion of Order of the Bath (CB) in 1905,^[9] Knight Commander of the Order of the Bath (KCB) in 1910,^[10] and a Knight Commander of the Order of St Michael and St George (KCMG) in 1923.^[11] He was later awarded Knight Grand Cross of the Order of St Michael and St George (GCMG) in the 1927 New Year Honours.^[12]

He married in 1902, Ella Walker (1881-1940), daughter of Thomas Spencer Walker. She predeceased him.

The Guillemard Bridge in Kelantan^[13] and the Guillemard Reservoir ^[14] in Penang are named after him.