The John F. Kennedy assassination and the subsequent conspiracy theories surrounding it have been discussed, referenced, or recreated in popular culture numerous times.

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John has been the papal name of several Coptic Popes.

John of Portugal (Portuguese: João) is the name of several Portuguese kings and other members of the Portuguese Royal Family:

John of Morigny (end 13th century - 14th century) was a French Benedictine monk renowned for his work on the form of medieval ritual magic known as the Ars notoria.

John Smith was Leader of the Labour Party and Leader of the Official Opposition from 18 July 1992 until his death on 12 May 1994. Smith became leader upon succeeding Neil Kinnock, who had resigned following the 1992 general election —for the fourth successive time, the Conservatives had won and Labour lost.

Sir John Betjeman (1906–1984) was a twentieth-century English poet, writer and broadcaster. Born to a middle-class family in Edwardian Hampstead, he attended Oxford University, although left without graduating. He turned down a position in the family furniture business, and instead took a series of jobs before becoming the assistant editor of The Architectural Review in 1931, which reflected a deeply held affection for buildings and their history. That same year he published his first book, Mount Zion, a collection of poems.

John of Whithorn (died 1209) was the medieval Bishop of Galloway. His first appearance as bishop-elect is at the coronation of Richard, Cœur de Lion as King of the English at Westminster Abbey on 3 September 1189. He was consecrated at Pipewell Abbey, Northamptonshire, on Sunday 17 September 1189.

To the Beat of a Different Drum is a double album by jazz musician John Coltrane released posthumously in 1978. It is a compilation of recordings in which Roy Haynes replaced Coltrane's regular drummer Elvin Jones.