Andrew Willoughby Ninian Bertie (15 May 1929 – 7 February 2008) was Prince and Grand Master of the Sovereign Military Order of Malta from 1988 until his death in 2008.

James Bertie (youngest son of the 7th Earl of Abingdon) and Lady Jean Crichton-Stuart (daughter of the 4th Marquess of Bute).

He was educated at the English Catholic public school, Ampleforth College, and graduated in Modern History from Christ Church, Oxford.

One of his pupils there was Dominique, Prince and Count de La Rochefoucauld-Montbel who would become Grand Hospitaller of the Order of Malta.

His full title was: His Most Eminent Highness Fra' Andrew Willoughby Ninian Bertie, Prince and Grand Master of the Sovereign Military Hospitaller Order of St. John of Jerusalem, of Rhodes and of Malta, Most Humble Guardian of the Poor of Jesus Christ.