Davies, 48, was born in Aberdare and was previously Head of Honda Motorcycles in Europe. He attended Aberdare Grammar School, is an Engineering graduate and started his career in the motor industry at Peugeot before moving to Honda UK in 1990.
He has spent 20 years with Honda, undertaking top-level general management roles, running both Honda's UK car and motorcycle businesses. He then progressed to his current role heading up Honda's European motorcycle business - a market leader across 27 countries.
Huw Evans, chairman of the Scarlets said: "In Mark we have a proven leader and business developer. He's a good communicator, has led businesses in the UK and Europe and has strong corporate marketing and sales experience - working within a very competitive industry and a performance-driven business.
"He's reached a point in his career when he clearly wanted to come back to roots with his family and was keen to use his experience in a role that allowed him to have a valuable input back in Wales. We are delighted with his appointment and look forward to welcoming him to Parc y Scarlets and introducing him to everyone connected with our region in late July."