Martin Donisthorpe Armstrong (1882-1974) was an English writer and poet, known for his stories. He was born in Newcastle-upon-Tyne, and educated at Charterhouse and Pembroke College, Cambridge. He served in World War I in the British Army in France; he was included in the final Georgian Poetry anthology.

He married in 1929 Canadian writer Jessie McDonald after she had divorced Conrad Aiken, making Armstrong the step-father of the young Joan Aiken. He appears in disguised form as a character in Conrad Aiken's Ushant.

Works

• Exodus (1912) poems
• Lady Hester Stanhope (1920) biography
• The Buzzards and other poems (1921)
• The Puppet Show (1922) stories
• The Bazaar and Other Stories (1924)
• Desert, a Legend (1926) novel
• Stepson (1927) novel
• The Sleeping Fury (1929) novel
• The Bird-catcher (1929) poems
• The Fiery Dive and Other Stories (1929)
• Collected Poems (1931)
• General Buntop's Miracle and Other Stories, (1934)
• A Case of Conscience and Other Tales (1937)
• Spanish Circus: Charles IV of Spain (1937)
• Victorian Peepshow (1938) autobiography