First Poems (poems) (1935)
Sebastian: New Poetry (poems) (1937)
Blind Men's Flowers Are Green (poems) (1940)
Poems, 1933-1945 (poems) (1946)
Imaginary Conversations: Eight Radio Scripts (1948)
Three tales of Hamlet (1950) (with Michael Innes)

Leon Bloy (1953)
My Bit of Dylan Thomas (1957) (see Dylan Thomas)
Four Absentees: Dylan Thomas, George Orwell, Eric Gill, J. Middleton Murry (1960) (see Colin Middleton Murry (Richard Cowper), George Orwell and Dylan Thomas)
The Fourfold Tradition: Notes On the French And English Literatures, with Some Ethnological And Historical Asides (1961)
The Intellectual Part: An Autobiography (1963)
Raymond Roussel: A Critical Study (1966)
The Double Image: Mutations of Christian Mythology in the Work of Four French Catholic Writers of To-day And Yesterday (1969)
Little Pattern of French Crime (1969)
Portrait of the Artist as a Professional Man (1969)
French Crime (1970)
Bluebeard and After: Three Decades of Murder in France (1972)
Sex War and Others: Survey of Recent Murder Principally in France (1973)
Reflections On the Newgate Calendar (1975)
Tales from the Newgate Calendar (1981)
Master Eccentric: Journals, 1969-81 (1986)
Existentialism: Or, the Philosophy of Existence (2002)