John Fitch may refer to:

• John Fitch (computer scientist) (born 1945), computer scientist, mathematician and composer
• John Fitch (inventor) (1743–1798), early American inventor, built the first steamboat in the United States in 1786
• John Fitch, Massachusetts settler for whom Fitchburg, Massachusetts is named
• John Fitch (racing driver) (1917–2012), racing driver, inventor of innovative safety devices and descendant of John Fitch (inventor)
• John A. Fitch (1881–1959), writer and professor of labor relations
• John H. Fitch, the eponym of YMCA Camp Fitch in Springfield, Pennsylvania
• John Knowles Fitch (1880–1943), founder of Fitch Ratings, Ltd
• John Nugent Fitch (1840–1927), botanical illustrator