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Geopolitics (from Greek γῆ "earth, land" and πολιτική politikḗ "politics") is the study of the effects of Earth's geography (human and physical) on politics and international relations. While geopolitics usually refers to countries and relations between them, it may also focus on two other kinds of states: de facto independent states with limited international recognition and; relations between sub-national geopolitical entities, such as the federated states that make up a federation, confederation or a quasi-federal system. 

At the level of international relations, geopolitics is a method of studying foreign policy to understand, explain and predict international political behavior through geographical variables. These include area studies, climate, topography, demography, natural resources, and applied science of the region being evaluated.

Geopolitics focuses on political power linked to geographic space. In particular, territorial waters and land territory in correlation with diplomatic history. Topics of geopolitics include relations between the interests of international political actors and interests focused within an area, a space, or a geographical element; relations which create a geopolitical system. "Critical geopolitics" deconstructs classical geopolitical theories, by showing their political/ideological functions for great powers.

According to Christopher Gogwilt and other researchers, the term is currently being used to describe a broad spectrum of concepts, in a general sense used as "a synonym for international political relations", but more specifically "to imply the global structure of such relations", which builds on "early-twentieth-century term for a pseudoscience of political geography" and other pseudoscientific theories of historical and geographic determinism.

Until around 2010, most discussions of geopolitics related to control over and access to oil and natural gas. From 2010 onwards, the geopolitics of renewable energy appeared received increasing attention.

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