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
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