Sir Weldon Dalrymple-Champneys, 2nd Baronet CB FRCP (7 May 1892 – 14 December 1980) was a British physician who was a leading figure in the public health service.
He was educated at Gresham's School and studied medicine at Oriel College, Oxford, and St Bartholomew's Hospital, London.
His studies were interrupted by the First World War when he served in the Grenadier Guards and reached the rank of captain.
In 1924 he changed his name by deed poll, adding his mother's surname to his father's and becoming Weldon Dalrymple Champneys.
His reputation, both as epidemiologist and administrator was very high, and his official reports to the Ministry of Health, especially those dealing with the medical aspects of milk supply, are of the greatest importance.In 1924 Weldon Dalrymple-Champneys married Anne Spencer Pratt.