Wesley Duaine Sweetser (1919–2006) was an English critic.

Born in National City, California, United States, he attended the University of Colorado, where he gained a Ph.D. in 1958 for a thesis on Welsh writer Arthur Machen. He served for a long period in the United States Air Force, reaching the rank of captain.

This enthusiasm led him to publish a valuable Machen biography and bibliography with Adrian Goldstone based on his earlier thesis. He played an important part in supporting the 1960s revival in Machen's works.

Works

• Arthur Machen: Essays by Adrian Goldstone, C. A. and Anthony Lejeune, Father Brocard Sewell (editor), Maurice Spurway, Wesley D. Sweetser, Henry Williamson. Llandeilo: St. Albert's Press, 1960.
• Sweetser, Wesley D. Arthur Machen. Twayne Publishers, 1964.
• A Bibliography of Arthur Machen by Goldstone, Adrian H.; Sweetser, Wesley D. University of Texas, Austin, Texas, 1973.
• Ralph Hodgson — a Bibliography by Wesley D. Sweetser. Garland, New York, 1980.