Mark Tennyson, 5th Baron Tennyson

Commander Mark Aubrey Tennyson, 5th Baron Tennyson (28 March 1920 – 3 July 2006), was a British peer. He was the second son of Lionel Tennyson, 3rd Baron Tennyson, and the Hon. Clare Tennant. The great-grandson of poet Alfred, Lord Tennyson, he succeeded his brother to the title in 1991.

Tennyson served in the Royal Navy from 1937 to 1960, rising to the rank of commander, and saw action during World War II. He was mentioned in dispatches in 1945 in recognition of his military service during the war. He was subsequently an executive of Rowntree Mackintosh and Joseph Terry & Sons. In 1964, he married Deline Celeste Budler (d. 1995). The two had no children.