Denby is a surname. Notable people with the surname include:
Charles Denby (disambiguation), several people including: Charles Harvey Denby (1830–1904), U.S. Civil War officer, diplomat in China Charles Denby Jr. (1861–1938), U.S. diplomat, scholar of Chinese culture Cindy Denby (1955–2026), American politician David Denby (academic), Irish academic, senior lecturer in French David Denby (born 1943), U.S. journalist, film critic for The New Yorker Edwin Denby (disambiguation), several people including: Edwin Denby (poet) (1903–1983), U.S. poet, novelist, dance critic Edwin Denby (politician) (1870–1929), U.S. politician, Secretary of Navy, noted in the Teapot Dome Scandal James Denby (1892–1977), English footballer Joolz Denby (born 1955), British poet and novelist Kara Denby (born 1986), U.S. swimmer Lorraine Denby, American statistician and Civil Air Patrol pilot Sam Denby (born 1998), U.S. YouTuber