- Law, John, 1671-17291
- Lawson, Andrew C. (Andrew Cowper), 1861-19521
- Leclair, J. H. (Joseph-Hermyle)1
- Ledyard, Edgar M. (Edgar Madison), 1875-1
- Lee, Thomas Jefferson, 1808-18911
- Lehman, Ambrose E. (Ambrose Edwin), 1851-19171
- Len Kne1
- Lester, John S., approximately 1834-19101
- Levasseur, Emile, 1828-19111
- Levette, G. M. (Gilbert M.)1
- Levorsen, L. A. (Levor A.)1
- Lewis, Samuel, 1753 or 1754-18221
- Lewis, Warner, 1805-18881
- Liewendahl, F.1
- Lindemann & Ludecke (Firm)1
- Listerud, W.H.1
- Lithuanian National Council (U.S.)1
- Lithy, Graham1
- Litogafía y Tipografía del Comercio (Caracas)1
- Ljunggren, Gustaf, 1817-1878?1