David Alexander Mackenzie (22 March 1922 – 31 December 1989) was a Scottish trade union leader.
He left school at the age of fourteen and found work with the London, Midland and Scottish Railway.
During World War II, he served in the Royal Navy.
[1] Returning to the railway after the war, Mackenzie became active in the Transport Salaried Staffs' Association (TSSA).
In this role, he began representing the union on various external bodies, including the Non-Manual Workers' Committee of the Trades Union Congress, the Air Transport and Travel Industry Training Board, and the Hotel and Catering Industry Training Board.