Mark Dejak, 21, of Farrell Street, was pronounced dead at South Nassau Communities Hospital in Oceanside, according to police.
Police said Dejak was operating a 2008 Honda motorcycle northbound on Lawson Boulevard when a 2001 school bus being driven by Faye Smith, 66, of Freeport, turned left across the northbound lanes to enter the school bus lot. No children were on the bus at the time, police said. Police did not identify the bus company.
The bike struck the bus, ejecting Dejak, police said.
The bus driver was not injured and police said no charges were filed in the accident - and no criminality is involved.