Former Wakefield Trinity star Moore, 36, will join in time for next season having previously helped Hunslet win the 2014 Championship 1 Grand Final.
“This is a major signing for us, and shows our intentions to develop this team, and fulfill our ambitions to become a future top Championship club,” said coach Gary Thornton.
“Richie has vast experience at Super League and Championship level, and will have a huge impact on our group.
“Well respected and well admired by many, he will be a major force on the field, and his professionalism, attitude and commitment to the cause, will rub off on others around him.
“We’ve lacked a player of Richie’s stature and experience, and I’m absolutely delighted he has joined us.”
Moore added: “I’m very happy about returning to Hunslet.
“I have some very good memories from my short time at the club culminating in that Grand Final win at Headingley.”