Encyclopedias, Almanacs, Transcripts, and Maps
- Microbial Symbiosis
- Microbial Taxonomy
- Microphthalmia with Linear Skin Defects (MLS)
- Microscope and Microscopy
- Microscope, Comparison
- Microtechnology
- Microtechnology
- Microteiids: Gymnophthalmidae
- Microwave Communication
- Microwave Communication
- Microwave Communication
- Mictaceans: Mictacea
- Mictlan
- Mid-Plate Earthquakes
- Midday Demons
- Middle-Class Victorian Men and Women Collect, Identify, and Preserve Plant and Animal Species, Broadening Human Knowledge of the Natural World and Transforming Biology into a Mature Science
- Midwest Psychic News
- Midwife Toads and Painted Frogs: Discoglossidae
- Miguel López de Legazpi
- Mikhail Semyonovich Tsvet (also Tswett)