John Long may refer to:
Contents
Politicians
- John Long (politician) (c. 1419–1478), English Member of Parliament for Cricklade
- John Long (c.1517-c.1600/2), MP for Knaresborough, Hedon, Shaftesbury and Newcastle-under-Lyme
- John Long (Irish politician), member of the Parliament of Ireland in 1689 for Midleton, County Cork
- John Long (North Carolina politician) (1785–1857), U.S. Representative from North Carolina
- John Davis Long (1838–1915), Governor of Massachusetts, later the U.S. Secretary of the Navy
- John Andrew Long (1869–1941), Senator in Northern Ireland
- John B. Long (1843–1924), U.S. Representative from Texas
Religion
- John Long (bishop) (1548–1589), Archbishop of Armagh
- John Long (evangelist) (1872–1962), Pentecostal preacher
- John Long (priest) (1913–2008), Anglican Archdeacon of Ely
Sports
- John Long (climber) (born 1957), American rock climber and writer
- John Long (basketball) (born 1956), American basketball player
- Johnny Long (American football) (1914–1975), American football quarterback
Others
- John Long (artist) (born 1964), artist and painter from Northern Ireland
- John Long (computer scientist) (born 20th century), British computer scientist
- John Dixon Long (1817–1894), American abolitionist
- John Luther Long (1861–1927), American lawyer and writer whose short story Madame Butterfly inspired the opera by Puccini
- Johnny Long (musician) (1914–1972), American violinist and big band leader
- John A. Long (born 1957), Australian paleontologist and author of children's books and popular science and adventure books
- Johnny Long, American computer security researcher and author
- John Varah Long (1826–1869), clerk for Brigham Young, the second president of The Church of Jesus Christ of Latter-day Saints
- John H. Long, Canadian political figure