The wheel of time or wheel of history is a concept found in several religious traditions and philosophies, notably religions of Indian origin such as Hinduism, Jainism, Sikhism, and Buddhism, which regard time as cyclical and consisting of repeating ages. Many other cultures contain belief in a similar concept: notably, the Q'ero people of Peru, the Hopi people of Arizona, and the Bakongo people of Angola and Democratic Republic of the Congo.

Kālacakra is a polysemic term in Vajrayana Buddhism as well as Hinduism that means "wheel of time" or "time cycles". "Kālacakra" is also the name of a series of Buddhist texts and a major practice lineage in Indian Buddhism and Tibetan Buddhism. The tantra is considered to belong to the unexcelled yoga (anuttara-yoga) class.