Others
- John Long (artist) (1964–2016), artist and painter from Northern Ireland
- John Long (computer scientist) (born 1935), British computer scientist
- John Long (blues musician) (born 1950), American country blues singer, fingerstyle guitarist, harmonica player and songwriter
- 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 (chemist) (1856–1918), president of the American Chemical Society
- John Herbert Long (1904–1985), English music teacher and organist
- John Long Ltd, publisher
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