Rato Machindranath Jatra (Nepali: रातो मच्छिन्द्रनाथको रथयात्रा), also known as Buṅga Dyaḥ Jātrā (Newar: बुंग द्यः जात्रा) is a Nepalese chariot festival which is held in Lalitpur, Nepal.

The festival is dedicated to Buṅga Dyaḥ, who is also venerated as Karunamaya (Newar: करुणामय, "the compassionate one"), an aspect of the Bodhisattva Avalokiteśvara and is popularly believed to bring the monsoon rains.

It begins on the 4th day of the bright fortnight of Bachhalā, the seventh month in the lunar Nepal Sambat calendar.

The chariot procession was instituted to celebrate the arrival of Bunga Dyah in Nepal and the end of a devastating drought.

The route of the chariot procession starts at Pulchok and passes through Gabahal, Mangal Bazar, Hakha, Sundhara, Chakrabahil, Lagankhel and ends at Jawalakhel.

After the Bhoto Jatra ceremony at Jawalakhel, the idol of Rato Machhindranath is taken back to Bungamati, where it spends the 6 months of the year.

Then, the Tantrik said that Guru Gorakhnath was angry, so he was meditating on the cushion of 9 mighty serpents whose duty was the prime reason of rainfall in the valley.

After the two chariots arrive in Jawalakhel, astrologers choose an auspicious date to hold the Bhoto Jatra festival.

According to legend, a Jyapu (Newar farmer) lost the vest which he had received as a gift from the serpent god Karkotaka Naga for doing him a favour.

There are two legends of the favor one of them being the Jyapu providing him some ayurvedic herbs by examining the ill wife of Karkotaka Naga which healed her.

A quarrel developed over the vest, and since neither party could prove ownership, it was agreed that the undershirt would be kept with Bunga Dyah until the rightful owner comes to claim it with adequate proof.