Name
- Lloyd, William Alford, of the Crystal Palace Aquarium1
- Lobley, James Logan, geologist1
- Lodge, Oliver Joseph, scientist; of Add MS 425811
- Lovén, Sven, Swedish zoologist1
- Lowry, Joseph Wilson, engraver1
- Lubbock, John William, astronomer1
- Lukis, William Collings, Rector of Wath; archaeologist1
- Lydekker, Richard, zoologist, d 19151
- Lyell, Charles, 1st Baronet, geologist1
- Lütken, Christian Frederik, Danish naturalist1
- MacKenzie, Morell, physician1
- Macleay, George, Knight, politician and explorer, 1809-18911
- Macoun, John, Canadian botanist1
- Macpherson, Hugh Alexander, naturalist1
- Majendie, Vivian Dering, KCB1
- Major, Richard Henry, Keeper of Printed Maps and Plans British Museum1
- Malaiss, Constantin, palaeontologist1
- Mantell, Gideon Algernon, FRS, geologist1
- Marcou, Jules, geologist1
- Margerie, Emmanuel Jacquin de, French geologist1