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