The third Parkes ministry was the nineteenth ministry of the Colony of New South Wales, and was led by Sir Henry Parkes in a coalition with Sir John Robertson. It was the third of five occasions that Parkes was Leader of the Government. The title of Premier was widely used to refer to the Leader of Government, but not enshrined in formal use until 1920. This ministry covers the period from 21 December 1878 until 4 January 1883.