Novels:
* The Spanish Farm (1924): A classic of the First World War literature, depicting the lives of civilians in a small French village during the war.
* The Boroughmonger (1927): A satirical look at English politics and social life.
* The Crime at Vanderlyn Heights (1929): A mystery novel.
* The Scarlet Pimpernel (1953): A sequel to the famous novel by Baroness Orczy.
Short Stories:
* The Silent Listener (1935): A collection of suspenseful short stories.
* The Short Stories of R.H. Mottram (1990): A selection of his best short stories.
Biographies:
* The Life and Letters of Hugh Walpole (1952)
* The Life of William Rothenstein (1960)
Other Works:
* The English Landscape (1932): A book about the English countryside.
* The History of the Royal Air Force (1954): A historical account of the RAF.
R.H. Mottram was a prolific writer, and his works are known for their strong characterization, realistic depictions of life, and insightful social commentary.