Footage shows guests singing and dancing at the ceremony, in the city of Hisar, northwest of New Delhi, when the music is interrupted by a single gunshot.
Screams could be heard as the groom collapsed to the ground after a bullet hit his head.
Incredibly, the groom survived the accidental shooting - but his condition has since been described as serious, Fox News reports.
Shooting incidents at weddings in India are not uncommon - despite a ban on celebratory gunfire, Daily Mail reported.
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