"We are very pleased with this signing. Darren's ability on both sides of the scrum will greatly add to our depth of resources at prop," said Brain. "I'm sure that he'll be keen to secure a starting berth in our team."
Morris has won 18 caps for Wales and toured Australia with the Lions in 2001.
"It's a great challenge for me joining up with Worcester and I was extremely encouraged when I met up with the coaching staff and management at the club," he said. "Worcester have real ambition and it's good to be part of that."