| Knud Knudsen - Edward Sheriff Curtis |
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| Knud Knudsen - Ewald Hoinkis - Oskar & Theodor Hofmeister - Huber |
    
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| Koichiro Kurita - Jack Spencer - Rodney Smith |
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| Konrad Brandel - Eugčne Atget |
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| Konrad Brandel - Nadar - Horace Hall |
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| L. Fiorillo - Unidentified photographer(s) |
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| L. Meder - William Dassonville - Albert Renger-Patzsch - Harry Callahan |
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| L.A. Huffman - W.R. Cross - Richard Throssel |
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| Ladislav Postupa - Irving Pobboravsky |
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| Lady Clementina Hawarden - Anderson - W. Stewart - Princess Victoria (attributed) - William Wegman |
    
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| Lala Deen Dayal - G.W Lawrie and Company - Samuel Bourne - Bourne & Shepherd - Unidentified photographer - James Ricalton |
    
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| Lambert & Co - Woodbury & Page |
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| Lambert & Co - Woodbury & Page - Wilhelm Burger |
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| László Moholy-Nagy - André Kertész |
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| László Moholy-Nagy - Maurice Tabard - Stefano Robino |
    
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| László Moholy-Nagy - Max Baur - Peter Hujar |
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| Lehnert & Landrock - J. Craig Annan |
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| Lehnert & Landrock - José Ortiz-Echagüe |
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| Leni Riefenstahl - Mikhail Grachev |
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| Léon Eugčne Méhédin - Félix Teynard - William de Wiveleslie Abney |
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| Leon Levinstein - Rodney Smith |
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| Leonard da Vinci - F. Bruckmann - Léon Gérard [The Last Supper] |
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| Lesthevenon - August Sander |
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| Lewis Carroll - Terry Evans |
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| Lewis Morley - Harold Chapman |
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| Lewis W. Hine - Alfred Stieglitz |
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| Lewis W. Hine - August Sander |
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| Lewis W. Hine - Unidentified photographer |
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| Lewis W. Hine - Unidentified photographer - Albert Renger-Patzsch |
    
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| Lewis W. Hine - Unidentified photographer - Peter Lindbergh |
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| Lieutenant Philip Henry Sharpe - Harold E. Edgerton |
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| Linnaeus Tripe - Thomas Rodger (attributed) - Giorgio Sommer |
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| Linnaeus Tripe - Thomas Ruff |
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| Lou Landauer - Peter Keetman - Siegfried Lauterwasser |
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| Louis de Clercq - Félix Bonfils - F. & E. Thévoz |
    |
| Louis de Clercq - John Anthony - Francis Frith - John Cramb |
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| Louis Jacques Mandé Daguerre (doubtful attribution) - JeanLoup Sieff |
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| Louis Vignes - Félix Bonfils |
    |
| Louis-Adolphe Humbert de Molard - Serge Levitsky - Nadar - Herbert Rose Barraud - Dr. R. Obermayer |
    
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| Louis-Emile Durandelle - Frederick H. Evans |
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| Louis-Jean Delton - Edgar Degas |
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| Louise Dahl-Wolfe - Herb Ritts |
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| Lt. Comdr. Charles Fenno Jacobs - Carl Mydans |
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| Lucien Clergue - Brett Weston |
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| Lucien Hervé - Beaumont Newhall |
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| Luigi Ghirri - Harry Callahan |
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| Luigi Pesce - Unidentified European artist |
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| Luigi Pesce - Unidentified photographer |
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| Malcolm Browne (Associated Press) - Unidentified photographer |
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| Man Ray - Brett Weston |
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