Air Marshal Sir Leonard Horatio Slatter, KBE, CB, DSC & Bar, DFC, DL (8 December 1894 – 14 April 1961) was a naval aviator during the First World War and a senior Royal Air Force commander during the Second World War.

[2] After successfully completing his observer training, Slatter was posted in February 1916 to the Seaplane Squadron at Dunkirk.

[2] During this time Slatter shot down six enemy aircraft, was awarded the Distinguished Service Cross twice.

[2] While still acting as an instructor, Slatter crossed the front lines and shot down his seventh and final enemy aircraft on 30 August 1918.

[3] After the war, Slatter opted to remain in the newly formed Royal Air Force.

[2] In early 1924 Slatter was substantively promoted to squadron leader and posted to Malta where he served as the commander of the RAF base for over two years.

[2] In late 1926, Slatter was appointed Officer Commanding the RAF High Speed Flight at the Marine Aircraft Experimental Establishment.

1 Group although he moved on to be Air Officer Administration at Headquarters British Forces in Iraq in 1940.

15 Group in February 1943, where his role was to ensure that vital materials were brought safely from the US to the UK,[7] before becoming Air Officer Commanding-in-Chief at RAF Coastal Command in June 1945.