John (Jock) Robert Liddell (born 1908) is a British writer, best known for his criticism of the novel, and for his biography of the poet Cavafy. He is also a novelist, travel writer and poet.

He was educated at Haileybury School and the University of Oxford. In the early 1930s he was a close friend of Barbara Pym, while working in the Bodleian Library. He appears as Dr. Nicholas Parnell, a character in one of her novels.

During World War II he was one of the Cairo poets. After the war he resided in Athens.

Works

• A Treatise on the Novel (1947)
• The Last Enchantments (1949)
• Unreal City (1952)
• Some Principles Of Fiction (1953)
• Aegean Greece (1954)
• The Novels of I Compton-Burnett (1955)
• Byzantium and Istanbul (1956)
• The Morea (1958)
• Old and New Athens by Demetrios Sicilianos (1960) translator
• The Novels of Jane Austen (1963)
• Mainland Greece (1965)
• The Deep End (1968) novel
• Stepsons (1969) novel
• Cavafy (1974) biography
• The Novels Of George Eliot (1977)
• Elizabeth & Ivy (1986)
• The Aunts (1987)
• The Abbe Trigrane by Ferdinand Fabre (1988) translator
• Mind at ease: Barbara Pym and her novels (1989)
• Twin Spirits: The Novels of Emily and Anne Bronte (1990)
• Kind Relations (1994)
• The Rivers of Babylon (1995)