thumb|Arms 10th to 14th Earls of Northesk
David John Carnegie, 10th Earl of Northesk (1865 – 5 December 1921), a Scottish representative peer
Early life
Carnegie was born on 1 December 1865. He was the eldest son of Lt.-Col. George Carnegie, 9th Earl of Northesk and Elizabeth Georgina Frances Elliot. His elder sister, Helen Alice Carnegie, married barrister Sir Francis Lacey, and his younger brothers were Lt.-Col. Hon. Douglas George Carnegie, MP, and Lt. Ian Ludovic Andrew Carnegie. They divorced in 1928 and he married Elizabeth "Betty" Vlasto, a daughter of Anthony Augustus Vlasto of Binfield Park and a cousin of the well-known tennis player Julie Vlasto, in 1929.
- Katharine Jane Elizabeth Carnegie (1904–1949), who married Lt.-Col. William Bridgeman Lambert Manley. After their divorce, she married Brig. Edward Leathley Armitage.
Lord Northesk died on 5 December 1921 at age 56 and was succeeded in the earldom by his only son, David. As his son died without male issue in 1963, the earldom passed to the 10th Earl's nephew, John Douglas Carnegie.