Admiral Sir St. John Reginald Joseph Tyrwhitt, 2nd Baronet, KCB, DSO, DSC & Bar (18 April 1905 – 10 October 1961) was a senior Royal Navy officer who served as Second Sea Lord and Chief of Naval Personnel from 1959 to 1961.
[2] After inheriting his father's baronetcy in 1951,[4] Tyrwhitt assumed command of the cruiser HMS Newcastle during the Korean War then became Flag Officer (Flotillas) to the Indian Navy in 1956,[5] and chief of staff to the commander-in-chief of the Mediterranean Fleet in 1958.
After promotion to vice-admiral on 3 November 1958,[6] he was appointed Second Sea Lord and Chief of Naval Personnel in 1959.
[2] He was appointed a Knight Commander of the Order of the Bath in the 1961 New Year Honours and was promoted to full Admiral on 11 September 1961.
[7] He died at Queen Alexandra Military Hospital, London, shortly after leaving office, on 10 October 1961, aged 56.