Yamuna Chhath is a Hindu festival that is celebrated on the sixth day (Shashti) of the bright fortnight (Shukla Paksha) of the lunar month of Chaitra (March-April). It is also known as Yamuna Jayanti, as it marks the birth anniversary of Goddess Yamuna, who is considered as one of the most sacred rivers in India.

Goddess Yamuna is believed to be the daughter of Lord Surya (the Sun God) and his wife Saranyu. She is also the sister of Yama (the God of Death), Vaivasvata Manu (the progenitor of mankind), and Ashvins (the twin gods of medicine). She is worshipped as the consort of Lord Krishna, who spent his childhood and youth near her banks in Mathura and Vrindavan.

Yamuna Chhath is observed with great devotion and enthusiasm by her devotees, especially in Mathura and Vrindavan, where she flows through. They take a holy dip in her waters at sunrise and sunset, and offer prayers, flowers, fruits, milk etc., to her idols or pictures. They also light lamps on earthen pots and float them on her surface. They sing hymns and songs praising her glory and grace.

Yamuna Chhath is believed to bestow blessings of purity, prosperity, health, love and happiness on those who worship Goddess Yamuna sincerely.