The former bodybuilder and governor of California was pictured at the scene, in photos shared by US media outlet TMZ, in Los Angeles on Friday afternoon.
A spokesperson for Mr Schwarzenegger told the BBC that the actor was behind the wheel of his SUV at the time of the incident, but was unharmed.
The four-vehicle collision took place just after 4.30pm local time on Sunset Boulevard, Los Angeles Police Department (LAPD) confirmed.
"There was a collision about 4.35 on Sunset and Allenford Avenue," an LAPD spokesperson told the PA news agency.
"It was a four vehicle traffic collision (and) fire departments and paramedics transported one female to a local hospital with an abrasion to her head.
"Neither alcohol nor drugs are suspected as a factor in this and all parties remained at the scene."