Reservoir may mean:

• Reservoir (water), an artificial lake created by flooding land behind a dam
• Reservoir, Victoria, a suburb of Melbourne

Reservoir may also mean:

• Oil reservoir, an accumulation of oil or gas beneath the earth's surface
• Pressure tank, part of a piping system
• Thermal reservoir, a heat bath that maintains the temperature constancy of a system
• An organism that carries and transmits a pathogen without being harmed by it. Reservoirs can also be vectors.

Reservoir