Lieutenant-Colonel Sir Walter Hugh Malcolm Ross, GCVO OBE GCStJ DL (27 October 1943[1] – 27 October 2019) was a member of the Royal Household[2] of the Sovereign of the United Kingdom, and from 2006 to 2008, master of the household to then Prince Charles.

He served in the Scots Guards from 1964 to 1987, holding the posts of Adjutant at the Royal Military Academy Sandhurst 1977–1979, and reaching the rank of Lieutenant-Colonel in 1982.

Ross joined the Royal Household in 1987 as Assistant Comptroller of the Lord Chamberlain's Office and Management Auditor.

In 2006, he was made Her Majesty's Lord Lieutenant of the Stewartry of Kirkcudbright, succeeding Sir Norman Arthur.

On 1 September 2016 he was appointed as the Lord Prior of the Most Venerable Order of the Hospital of Saint John of Jerusalem.