John Long
John or Johnny Long may refer to:
Music
- John Long (blues musician), American country blues singer, fingerstyle guitarist, harmonica player and songwriter
- Johnny Long (musician), American violinist and big band leader
- John Herbert Long, English music teacher and organist
Politics
- John Long (MP for Cricklade), English Member of Parliament for Cricklade
- John Long (16th-century MP), MP for Knaresborough, Hedon, Shaftesbury and Newcastle-under-Lyme
- John Long (North Carolina politician), U.S. representative from North Carolina
- John Davis Long, governor of Massachusetts, later the U.S. Secretary of the Navy
- John B. Long, U.S. representative from Texas
- John Andrew Long, senator in Northern Ireland
- John David Long, South Carolina state senator
- John H. Long (political candidate), Canadian political figure
- J. H. Long, American politician
- John V. Long, member of the Utah territorial legislature and clerk for Brigham Young
Science
- John Long (computer scientist), British computer scientist
- John A. Long, Australian paleontologist and author of children's books and popular science and adventure books
- John H. Long (chemist), president of the American Chemical Society
Sports
- John Long (climber), American rock climber and writer
- John Long (basketball player), American basketball player
- Johnny Long (American football), American football quarterback
- John Long (basketball coach), college men's basketball coach
- John Long (Australian footballer), Australian rules footballer
- John Long (Gaelic footballer), Irish Gaelic footballer
Other fields
- John Long (artist), artist and painter from Northern Ireland
- John Long (evangelist), Pentecostal preacher
- John Long (priest), Anglican Archdeacon of Ely
- John Dixon Long, American abolitionist
- John Luther Long, American lawyer and writer whose short story "Madame Butterfly" inspired the opera by Puccini
- John Long, founder of John Long Ltd, a now-defunct publishing firm based in London