The Coronet of Charles, Prince of Wales is a small crown that is part of the Honours of Wales. The gold coronet, with diamonds set in platinum, was made for and used by King Charles III at his investiture as Prince of Wales in 1969. Designed by the artist Louis Osman, the coronet was a gift from the Worshipful Company of Goldsmiths to the Prince's mother, Queen Elizabeth II. It has been described as modern but its form is traditional. The coronet is on permanent display in the Jewel House at the Tower of London.

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.