A deflector is a type of technology which utilizes a projected energy source to protect a moving object from other objects and energy sources. A deflector beam or deflector field is a type of force field, usually originating from specialized constructions, described as deflector arrays or deflector dishes.

In use by technologically advanced races and cultures, deflectors are usually an outgrowth of earlier technology that involved polarizing protective plating.

Deflectors come in different types, ranging from lower-yield navigational deflectors used by starships and other vehicles to clear stray materials and substances from travel paths, to larger deflector shields used to protect vehicles from high-yield energy interactions and collisions (such as weapon fire). [citation needed]