| Honorific Prefix: | Admiral |
| Sir William Pillar | |
| Birth Date: | 24 February 1924 |
| Allegiance: | United Kingdom |
| Branch: | Royal Navy |
| Serviceyears: | 1942–1984 |
| Rank: | Admiral |
| Commands: | Royal College of Defence Studies Royal Naval Engineering College |
| Battles: | Second World War Korean War |
| Awards: | Knight Grand Cross of the Order of the British Empire Knight Commander of the Order of the Bath |
| Spouse: | Ursula Ransley |
Admiral Sir William Thomas Pillar, (24 February 1924 – 18 March 1999) was a senior Royal Navy officer who served as Chief of Naval Support and a member of the Admiralty.
Educated at Blundell's School and latterly at the Royal Naval Engineering College, Pillar joined the Royal Navy as a cadet in 1942 during the Second World War.[1] He was promoted to sub-lieutenant (Engineering Branch) on 1 June 1944. An acting lieutenant at the war's end, he was promoted to substantive lieutenant (E) on 3 June 1947 (seniority 1 October 1945). Following service in the Korean War he was promoted to lieutenant-commander (E) on 1 October 1953, to commander (E) on 31 December 1958 and to captain (E) on 31 December 1966.
Pillar was appointed Assistant to the Director-General, Ships in 1970 and Commander of the Royal Naval Engineering College in 1973.[1] Attaining flag rank as a rear admiral on 7 January 1976, he was made Port Admiral at Rosyth and then Assistant Chief of Fleet Support.[1] Promoted to vice admiral on 2 April 1979, he became the first Royal Navy engineer officer to be Chief of Fleet Support. He was appointed a Knight Commander of the Order of the Bath (KCB) in the 1980 Birthday Honours, and was promoted to admiral on 5 January 1982. In 1982, he became Commandant of the Royal College of Defence Studies.[1] Appointed a Knight Grand Cross of the Order of the British Empire (GBE) in the 1983 Birthday Honours, he retired on 6 March 1984.
On retirement from the Royal Navy Pillar became Lieutenant-Governor and Commander-in-Chief of Jersey.[1] He was also Commodore and later Life Vice-Commodore of the Royal Navy Sailing Association,[2] a member of the Royal Yacht Squadron,[1] President of the Royal Navy Modern Pentathlon Association and a Knight of St. John.
In 1946 Pillar married Ursula Ransley; they had three sons and a daughter.[1]
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