Lieutenant-Colonel Dudley Churchill Marjoribanks, 3rd Baron Tweedmouth, CMG, MVO, DSO (2 March 1874 – 23 April 1935) was a British army officer and courtier.

[1] He succeeded his father as the 3rd Baron Tweedmouth and is thus descended from Joseph Marjoribanks, a wine and fish merchant in Edinburgh who died in 1635.

He was Mentioned in dispatches, was awarded the Queen's South Africa Medal with six clasps and was appointed a Companion of the Distinguished Service Order (DSO) on 29 November 1900.

[7] In September 1902, Marjoribanks accompanied Lord Roberts, Commander-in-Chief of the Forces, and St John Brodrick, Secretary of State for War (and his father-i-law), on a visit to Germany to attend the German army maneuvers as guest of the Emperor Wilhelm.

[9] Marjoribanks and his wife attended the 1903 Delhi Durbar to mark the accession of King Edward VII as Emperor of India.