J
- Nat Jackley English comic actor.
- Andrew Jackson, U.S. President. Harmony Lodge No. 1
- Jesse Jackson, US Civil Rights leader and Politician, Harmony Lodge No. 88, Chicago, Illinois (PHA)
- Robert H. Jackson, U.S. Supreme Court Associate Justice (1941–1954)
- John Jay, Chief Justice of the United States (1789–1795)
- Major-General (retired)Michael Jeffery AC, CVO, MC Governor-General of Australia (2003–2008) and Former CO of SAS Regiment, Initiated in St George’s Lodge No 6 on 23 November 1994.
- John Jellicoe, British Admiral of the Fleet, and Governor-General of New Zealand, Grand Master of the Grand Lodge of New Zealand
- Edward Jenner, British scientist; discovered vaccination. Elected FRS on 26 February 1789; initiated in Lodge of Faith and Friendship No. 449, Gloucestershire
- Andrew Johnson, U.S. President. Greenville Lodge No. 119, Tennessee
- Jack Johnson, African American boxer, initiated in Dundee, Scotland
- "Turkey Creek" Jack Johnson, peace officer and posseman in Wyatt Earp's infamous "vendetta ride" Mt. Moriah Lodge #2, F.& A.M., Salt Lake City, Utah
- Lyndon B. Johnson, U.S. President. Johnson City Lodge No. 561, Texas (EA degree only)
- Al Jolson, Actor, St. Cecile Lodge No. 568, New York
- Anson Jones, congressman, doctor, last President of the Republic of Texas, Harmony Lodge #52 Philadelphia
- John Paul Jones, Naval hero during the American Revolution, St. Bernards Lodge No. 122, Kirkudbright, Scotland
- Nathaniel R. Jones (1926 - Living) American lawyer, jurist, and academic, Judge on U.S. Court of Appeals for the Sixth Circuit.
- Benito Juárez, President of Mexico. Rito Nacional Mexicano de la Logia Independiente, No. 02
- Slobodan Jovanović (1869–1958), Serbian jurists, historians, sociologists and president of the Yugoslav government in exile, in London, during World War II.
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