Ananta Chaturdashi (Sanskrit: अनंतचतुर्दशी, romanized: Anantacaturdaśī) is a festival dedicated to Vishnu, observed and celebrated by Hindus.

According to the Agni Purana, the Ananta (Shesha; the divine serpent) manifestation of Vishnu is venerated on this occasion to free adherents from sins.

It recounts the story of a woman named Sushila, who encountered a group of women worshipping Ananta near a riverbank.

The form of Ananta was made out of darbha (sacred grass) and placed in a basket, whereby it was offered worship with scented flowers, oil lamp, incense sticks, and food they had prepared.

He asked him to observe the Ananta Chaturdashi vow for fourteen years, promising him prosperity and an eternal abode in the stars after his demise.

[citation needed] In parts of Nepal, Bihar and Eastern Uttar Pradesh, the festival is closely linked to Kshira Sagara (Ocean of Milk) and Vishnu's Anantarupa (form of Ananta).

Fourteen tilakas (small vertical strips) of kumkuma or sindoor (vermilion powder) are made on a wooden plank.