Reports say the J1 student is from Cork
The Department of Foreign Affairs is providing consular assistance after an Irish man was attacked in the US.
The J1 student - who is originally from Cork - was assaulted in San Diego, California.
The incident happened early last Friday in the Pacific Beach area of the city.
He is said to be in a serious condition in hospital.
"We're aware of the case and are providing consular assistance", a spokesman for the department told Newstalk.com.
San Diego is one of the most popular destinations for J1 students.