Author
- Johannes Leonis1
- Johannes Paulus1
- John Bale1
- John Capgrave1
- John Cassian1
- John Fortescue1
- John Gage1
- John Larry England1
- John Lydgate1
- John Mandeville1
- John Skyrrow1
- John Tiptoft, 1st Earl of Worcester1
- Jonathan Eybeschutz1
- Jordan von Quedlinburg1
- Joseph Haslewood1
- José Pellicer1
- João Freire1
- Juan Gallo1
- Juan Martínez Silíceo1
- Juan Vicente de Güemes, 2nd Count of Revillagigedo1