The incident happened around 8:30 p.m. on Christopher Columbus Drive between Grove Street and Jersey Avenue, city spokeswoman Kimberly Wallace-Scalcione said.
He was brought Jersey City Medical Center with life-threatening injuries. An update on his condition was not immediately available.
The driver of the shuttle bus stayed at the scene, called police, and is cooperating with the investigation, the spokeswoman added.
A 31-year-old Jersey City has been missing for more than a week after he was last seen leaving his home for a night out, authorities said.
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A Jersey City man told police he was attacked from behind and robbed Sunday night while he was walking to the supermarket, police said.
The 63-year-old man said he was walking from his home just after 8 p.m. when he was punched in the back of the head several times on Virgina Avenue near Ocean Avenue, Jersey City police spokeswoman Kimberly Wallace-Scalcione said.
The victim said the assailant stole his cell phone, an older model Samsung Galaxy, Wallace-Scalcione said.
The man was taken to RWJBarnabas Healths Jersey City Medical Center and was treated for minor injuries, police said.