A 54-year-old man was stabbed multiple times Wednesday morning aboard an MTA bus on Randall’s Island, cops said.

The attacker pulled a knife on the M35 bus while it was stopped outside the Manhattan Psychiatric Center just after 11:15 a.m. and stabbed the man in the chest, shoulder and head during an argument, according to police.

The knife-wielding man ran off after the violent incident, cops said.

The victim was rushed to Harlem Hospital and is expected to survive, police said.