Loka is a concept in Hinduism and other Indian religions, that may be translated as a planet, the universe, a plane, or a realm of existence. In some philosophies, it may also be interpreted as a mental state that one can experience. A primary concept in several Indian religions is the idea that different lokas are home to various divine beings, and one takes birth in such realms based on their karma.

In esoteric cosmology, a plane is conceived as a subtle state, level, or region of reality, each plane corresponding to some type, kind, or category of being.