(George) James Henry Lees-Milne (6 August 1908 – 28 December 1997) was an English writer and expert on country houses, who worked for the National Trust from 1936 to 1973. He was an architectural historian, novelist and biographer: his extensive diaries remain in print.
Lees-Milne was born into a prosperous manufacturing family on 6 August 1908 in Wickhamford, Worcestershire. He attended Lockers Park School in Hertfordshire, Eton, and Oxford University from which he graduated with a Third Class in History in 1931. From 1931 to 1935, he was Private Secretary to George Lloyd, 1st Baron Lloyd of Dolobran.
In 1936 he was appointed secretary of the Country Houses Committee of the National Trust. He held that position until 1950, apart from a period of military service from 1939 to 1941. During that time he was a regular contributor to the Trust's member newsletter, penning various features. He was instrumental in the first large-scale transfer of country houses from private ownership to the Trust. After resigning his full-time position in 1950, he continued his connection with the National Trust as a part-time architectural consultant and member of committees.
Lees-Milne was visiting Diana Mosley when King Edward VIII abdicated. His visit there was to examine the seventeenth-century house she and her husband Sir Oswald Mosley were then renting; he recorded later how he and Diana (her husband was in London) had listened to the King's broadcast abdication speech with tears running down their faces. He had loved her brother Tom Mitford when they were at Eton College, and was devastated when Tom was killed in action in Burma in 1945.