David Charles Samuel Montagu, 4th Baron Swaythling (6 August 1928 – 1 July 1998), was a British peer who held prominent positions in a number of notable British companies. He succeeded to the title of 4th Baron Swaythling in 1990 on the death of his father, Stuart Albert Samuel Montagu, 3rd Baron Swaythling OBE. His photographic portrait by Godfrey Argent was commissioned for the National Photographic Record in 1969, and is held at the National Portrait Gallery. He appears in two other photographs (taken in 1928 and in 1948) in the archives of the National Portrait Gallery.