A Geological phenomenon is a phenomenon which is explained by or sheds light on the science of geology.

Examples of geological phenomena are:

• Bradyseism
• Caves
• Continental drift
• Earthquake
• Erosion
• Geysers and hot springs
• Glaciation
• Impact crater
• Landslide
• The Earth's magnetic field
• Oceanic trench
• Orogeny
• Sedimentation
• Slump
• Stream capture
• Volcanic eruption
• Quciksand