Henry Evelyn Alexander Dewar, 3rd Baron Forteviot (23 February 1906 – 25 March 1993), was a Scottish businessman. He was the son of John Dewar, 1st Baron Forteviot and Margaret Elizabeth Holland.
He was invested as a Member of the Order of the British Empire (M.B.E.) in 1943.
His daughter Caroline married in 1956 James Carnegie, 3rd Duke of Fife, only son of Princess Maud, Countess of Southesk and great-grandson of King Edward VII. Henry succeeded in 1947 as Baron Forteviot from his half-brother John who died childless.
His daughter Penelope married in 1959 Norman Frank Butler, eldest son of Paul Butler of Oak Brook, Illinois, and grandson of Frank O. Butler, also of Oak Brook (J.W. Butler Paper Mills, Chicago). They had three children - Paul Butler, Tiggy (Tracey) Butler and Sean Butler.
He is buried with his wife in the family plot at Aberdalgie just west of Perth.
He was educated at Eton College, Eton, England. In 1929 he graduated from St. John's College, University of Oxford, England, with a Bachelor of Arts (B.A.). He was chairman of John Dewar & Sons between 1954 and 1976.
He married Cynthia Monica Starkie (d.1986), daughter of Piers Cecil Le Gendre Starkie and Cicely de Hoghton, on 25 April 1933.
They had four children: