Sir Wilfrid Bliss Spender, KCB, DSO, MC (6 October 1876 – 21 December 1960) was a British Army officer, colonial administrator and civil servant who helped re-organise the Ulster Volunteers (UVF) into the Ulster Special Constabulary and was responsible for laying the foundations for the civil service of Northern Ireland. He served as Secretary to the government of Northern Ireland from 1921-1925 and Permanent Secretary to the Ministry of Finance from 1925-1944. He was knighted in 1929. His wife, Lady Spender (née Alice Lilian Dean; 1880-1966), was a member of the UVF Nursing Corps and worked in the Ulster Division Comforts Fund during World War I. Later in life Spender became a noted diarist.
Wilfrid Bliss Spender was born in Plymouth, England, the third son of Edward and Ellen (née Rendle) Spender. His father was co-founder of the Western Morning News in Plymouth. When Wilfrid was one year old, his father and two elder brothers were drowned whilst boating at Whitsand Bay outside Plymouth.
He was educated at Winchester College and the Staff College, Camberley. He obtained a commission first in the Devon artillery. In 1897 he joined the Royal Artillery, seeing service in Bermuda, Canada, Malta, England, Ireland, and India. He was promoted to lieutenant 18 June 1900, and to captain on 13 February 1902. After Camberley he was nominated to attend a naval war course, one of the first two army staff officers to be so chosen. In 1909 became a member of the home defence section of the Imperial Defence Committee, which was then involved with the general defence of the United Kingdom. He was at one point the youngest staff officer in the British army.