English critic and man of letters, who was the friend and, after 1879, protector, agent, and nurse of the poet Algernon Charles Swinburne (Swinburne, Algernon Charles).

Watts studied law and practiced in London, but his real interest was literature. He contributed regularly to the Examiner and was the chief poetry reviewer of the Athenaeum from 1876 to 1902. He wrote the article on poetry for the 9th edition of the Encyclopædia Britannica (1885). He changed his surname to Watts-Dunton in 1896.

Much interested in the Roma (Gypsies), he wrote introductions to later editions of George Borrow (Borrow, George)'s books Lavengro and Romany Rye, which had been first published in the 1850s. Watts-Dunton's very successful novel Aylwin (1898) is a romance that also contains a fictional portrait of Dante Gabriel Rossetti (Rossetti, Dante Gabriel) and his circle. His other published works include the novel Vesprie Towers (1916) and a book of poems, The Coming of Love (1897).

Swinburne, already in poor health, collapsed completely in 1879 but recovered under Watts-Dunton's care, which continued for some 30 years. Watts-Dunton's memoirs, Old Familiar Faces (1916), are a valuable record of his life and times.