Encyclopedias, Almanacs, Transcripts, and Maps
- Mesoamerican Burrowing Toads (Rhinophrynidae)
- Mesoamerican Religions
- Mesoamerican Religions: Classic Cultures
- Mesoamerican Religions: Colonial Cultures
- Mesoamerican Religions: Contemporary Cultures
- Mesoamerican Religions: Formative Cultures
- Mesoamerican Religions: History of Study
- Mesoamerican Religions: Mythic Themes
- Mesoamerican Religions: Postclassic Cultures
- Mesoamerican Religions: Pre-Columbian Religions
- Mesopotamian Religions
- Mesopotamian Religions: History of Study
- Messianism
- Messianism: An Overview
- Messianism: Jewish Messianism
- Messianism: Messianism in the Muslim Tradition
- Messianism: South American Messianism
- metalloid
- Metals and Metallurgy
- Metals, as Contaminants