Hemisphere
Hemisphere refers to:

A half of a sphere

As half of the Earth
A hemisphere of Earth
Northern Hemisphere
Southern Hemisphere
Eastern Hemisphere
Western Hemisphere
Land and water hemispheres
A half of the (geocentric) celestial sphere
Northern celestial hemisphere
Southern celestial hemisphere
A cultural hemisphere

As half of the brain
A cerebral hemisphere, a division of the cerebrum
A half of the cerebellum, a smaller part of the brain

Other
Hémisphère (Paradis), a 12-inch album by French artists Paradis
Hemispheres (magazine), an inflight publication
Hemispheres (TV series), Canadian and Australian news program
Hemispheres (Rush album), 1978
Hemispheres (Lily Afshar album), 2006
Hemispheres (Doseone album), 1998
L'Hemisfèric at the Ciutat de les Arts i les Ciències, Valencia, Spain
Hemisphere Project, a counternarcotics program between United States federal and state drug officials and AT&T