Look up sphere of influence in Wiktionary, the free dictionary.

A sphere of influence is a spatial region over which a state or organization has a level of exclusivity.

Sphere of influence may also refer to:

Science

• Sphere of influence (astrodynamics), the region around a celestial body in which that body is the biggest gravitational influence
  • Sphere of influence (black hole), the region around a supermassive black hole

Other uses

• "Sphere of influence", in planning settlement hierarchy
• Nobunaga's Ambition: Sphere of Influence, a Japanese video game in the Nobunaga's Ambition series
• "Sphere of Influence" (Star Wars: The Clone Wars), an episode of the television series

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