The incident happened in East Patchogue, on Americus Avenue south of Brookhaven Avenue, at around 8 p.m. Thursday, July 18.
Suffolk County Police said the man, Noe Moran Contreras, of East Patchogue, was operating a dirt bike when he lost control and struck a pole.
He was taken by ambulance to Long Island Community Hospital in Patchogue where he was pronounced dead.
Investigators impounded the bike for a safety check.
The identity of the victim has not yet been released.
Anyone with information is asked to contact the Suffolk County Police Department at 631-854-8552.
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