The investiture of Charles, Prince of Wales, took place in Caernarfon Castle, north Wales, on 1 July 1969. The ceremony formally presented the title of Prince of Wales to the 20-year-old Charles, eldest son of Queen Elizabeth II. He was the 21st heir to the English or British throne to hold the title. The investiture was a revival of a ceremony which had first been used for the previous prince of Wales, Edward, in 1911. The 1969 event was watched by 500 million people worldwide on television, but it received some opposition in particular from Welsh nationalist organisations.

The Prince of Wales is sometimes presented and invested with the insignia of his rank and dignity in the manner of a coronation. The title is usually given to the heir apparent of the English or British throne. An investiture is ceremonial, as the title is formally conferred via letters patent issued by the monarch.