Matthew Young Orr FRSE (1883-1953) was a 20th-century British botanist and a specialist on conifers.
In the First World War he served as a lieutenant in the 7th battalion Royal Scots in Gallipoli and Palestine.
[2] He returned to the Royal Botanic Gardens after the war and worked under William Wright Smith.
He later worked with both John Macqueen Cowan and Roland Edgar Cooper.
His proposers were Sir William Wright Smith, Malcolm Wilson, John Macqueen Cowan, and Alexander Nelson.