- Dictionary of Petroleum and Oilfield Terminology - Glossary of terms. The list is searchable and also contains links to further information.
- Earthquake Image Glossary - Heavily illustrated glossary of common terms in seismology.
- Geological and Gem Terminology - Jillian Banfield's glossary of geological and gem-related vocabulary.
- Geology Dictionary - Geology.com - Definitions of terms, written at a level appropriate for students in introductory courses.
- GeologyLink Glossary - Indexed glossary of geology terms.
- Glacier Glossary - An A-to-Z glossary of glacier terms written by the professor and students of an NEIU glaciology class.
- Glossary of Selected Geologic Terms - Glossary of selected geological terms from the University of Nebraska-Lincoln.
- Schlumberger Oilfield Glossary - Defines many terms related to oil and gas exploration and production. Includes illustrations.
- USGS Photo Glossary of Volcanic Terms - Illustrates and describes commonly used volcano-related terms.
- Volcanic and Geologic Terms Glossary - Common terms defined.
