A 29-year-old man was stabbed in the neck on a Bronx subway platform on New Year’s Day, authorities said.

The critically injured victim was attacked with an “unknown cutting instrument” on the southbound B and D train platform at Grand Concourse and East 182nd Street in Fordham Heights around 8:50 p.m. Monday, cops said.

He was taken to St. Barnabas Hospital, where he remained clinging to life Tuesday morning, police said.

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“Multiple individuals” were taken into custody over the violence, with charges pending, police said.

The motive for the stabbing remains under investigation, they said.