लोक एक संस्कृत शब्द है जिसका अर्थ होता है 'संसार'। जैन ग्रन्थ और हिन्दू साहित्य में इसका प्रयोग होता है। जैन ब्रह्माण्ड विज्ञान के अनुसार इस ब्रह्माण्ड में तीन लोक है।

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.