Donald James Johnston, PC, OC, QC (June 26, 1936 – February 4, 2022) was a Canadian lawyer, writer and politician who was Secretary-General of the Organisation for Economic Co-operation and Development (OECD) from 1996 to 2006. He was the first non-European to head that organization. From 1978 to 1988, Johnston was a Liberal Party member of the Canadian parliament and served in the cabinets of prime ministers Pierre Trudeau and John Turner. In addition, he was the president of the Liberal Party of Canada from 1990 to 1994. Johnston was an Officer of the Order of Canada, and an Officer of the French National Order of the Legion of Honour.