Bennett was in San Antonio, Texas, for the Alamo Comic-Con, a convention for comic book enthusiasts, at the weekend.
He has also appeared in the Hobbit movies and the TV series Arrow.
News website My San Antonio reports that preliminary details released by the San Antonio Police Department indicate that Bennett allegedly punched a 29-year-old man in the face at a party at the Grand Hyatt Hotel shortly after 4.30 am (local time) on Sunday.
Arrest records filed in the Bexar County Magistrate's Office stated the 45-year-old actor was charged with assault causing bodily injury and was being held on a US$1600 (NZ$2527) bond.
He was released at 12.55pm on Sunday and court records state that he left the area.
San Antonio, the seventh most populated city in the US, is south of Dallas.
In Texas, the charge of assault causing bodily injury is a Class A misdemeanour.
According to Kiele Linroth Pace, a criminal law firm in Austin, Texas, the default maximum punishment for a Class A misdemeanour is one year in county jail and a US$4000 fine.
"But the punishment range may be enhanced for those with prior convictions. A jail sentence may also be probated, depending on various factors, in which case a defendant may not actually spend any time in jail,'' the firm's website said.
Bennett's New Zealand management agency Johnson & Laird Management said today they would not comment on the situation.
- NZ Herald and NZME.
