The 1951 King's Birthday Honours in New Zealand, celebrating the official birthday of King George VI, were appointments made by the King on the advice of the New Zealand government to various orders and honours to reward and highlight good works by New Zealanders. They were announced on 7 June 1951.

Sir William John Polson was a New Zealand politician, first as an Independent and then in the National Party. He joined the National Party on its formation in 1936, and "later acted effectively as Holland's deputy".