Sir John Gladstone Black McDonald (6 December 1898 – 23 April 1977) was 37th Premier of Victoria (leading the Country Party) from 27 June 1950 to 17 December 1952, except for a few days in October 1952 when Thomas Hollway led a brief Electoral Reform League government.

McDonald came to office by defeating Hollway's Liberals, but was himself vanquished by the Labor Party under John Cain in 1952.

After the death of his father, McDonald and his family emigrated to Australia in 1912 and settled in Shepparton, Victoria where they ran a dairy farm.

[1] On 4 March 1916, McDonald (who was 17 at the time) enlisted in the Australian Imperial Force during World War I, in which he served with the 37th Battalion[2] on the Western Front.

In July 1929, after only serving twelve months on the council, he announced that he would not seek reelection for a second term in office.