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- Elizabeth McClintock
- William McCalla
- John Macoun
- Peter MacOwan
- Pierre Magnol
- Joseph Maiden
- Marcello Malpighi
- Gustav Mann
- Charles Maries
- Rudolf Marloth
- Humphry Marshall
- Carl Friedrich Philipp von Martius
- John M. MacDougal
- William Keble Martin
- John Martyn
- Genkei Masamune
- Francis Masson
- Carl Maximowicz
- Rogers McVaugh
- Gregor Mendel
- Archibald Menzies
- Konstantin Merezhkovsky
- Franz Meyen
- André Michaux
- Philip Miller
- Charles Frederick Millspaugh
- Friedrich Anton Wilhelm Miquel
- Charles-François Brisseau de Mirbel
- John Mitchell
- Hugo von Mohl
- Charles Theodore Mohr
- Paul Möhring
- George Thomas Moore
- Robert Morison
- Cornelius Herman Muller
- Ferdinand von Mueller
- Otto von Münchhausen
Read more about this topic: List Of Botanists