Durutalo, 29, has played 15 times for his country, and made three appearances at the 2015 World Cup.
He also represented the US sevens side at the Rio Olympics and played Super Rugby for the Japan-based Sunwolves.
"I've always wanted to experience rugby in the UK," said Durutalo. "I'm very humbled and privileged to have this opportunity."
Ealing Trailfinders have signed USA Eagles back rower Andrew Durutalo for the 2017-18 Championship season.