Jyotisha (jyotiṣa, in Hindi and English usage Jyotish) is the Hindu system of astrology, one of the six disciplines of Vedanta, and regarded as one of the oldest schools of ancient astrology to have had an independent origin, affecting all other schools in and around India. The Sanskrit word derives from jyótis (disjointed as "Ja"+"Ya"+"O"+"T"+"ish" to get the root meaning as "water or birth"+"in addition to" + "earth" and "stars" + "knowledgeable" equating as one who is knowledgeable, or enlightened with knowledge, of birth, fate, and relationship to water, earth and stars) or which means "light, brightness", but in the plural also "the heavenly bodies, planets and stars".

Jyotish has historically been part of a continuous "holistic" approach to living and to spiritual practice within the life of Hindus predominant in India.

Jyotish is often discussed as the instructional element of the Rig Veda, and as such is a Vedanga, or "body part" of the Vedas, namely called the Eye of the Veda, for its alleged ability to view both phenomenal reality and wisdom itself. Part of a larger Vedic curriculum including mathematics, architecture, medical and military applications. Jyotish has its own sophisticated reference to the noumenal: the planets are "grahas", which are thought to seize or act upon created beings and influence their actions and life.

As Hindus believe that humans have fortune and misfortune in life because of karma, many use Jyotish to understand the downs in life due to the influence of planets, i.e., Navagraha and perform religious ceremonies to mitigate bad karma.