- J. G. Northrup Papers, 1917/19191
- J. H. Warsing Diary, 18771
- J. O. Humphreys Civil War diary transcription, 18642
- Jack D'Ambrosio Diaries, 1977/19851
- Jack Paton Diary, 19231
- Jacob W. Smiley Diary, 1863/18641
- James B. Moss, Jr. World War II diary, 1943/19442
- James Crawford Diary, 1854/18561
- James Fenton Bryant Papers, 1873/19031
- James Galt Diary, 1835/18441
- James Galt Diary, 1844/18501
- James Galt Diary, 1851-1854, 1851/18541
- James Galt Diary, 1859-1864, 1859/18641
- James Poyntz Nelson Manuscript Volumes, 1883/18941
- James Riddick Wilson Diary, 1819/18461