Rob will be a new bad boy for the cobbles, arriving in Weatherfield following a stint in prison.
Carla (Alison King) will find that Rob needs her help to make a fresh start as he settles in.
The newcomer will also quickly develop a reputation as a ladies' man, setting his sights on Eva Price (Catherine Tyldesley) along with other women on the street.
Baylis told itv.com: "I feel incredibly honoured to be joining the very talented cast of Coronation Street. Rob is an exciting character to play and I am hoping he is going to ruffle a few Weatherfield feathers."
Coronation Street's producer Phil Collinson added: "I'm very pleased to welcome Marc to the cast - the latest in a long line of handsome Corrie charmers. Carla's brother Rob is sure to set hearts fluttering in Weatherfield from the minute he arrives. The audience can expect thrills and a few broken hearts when this handsome bad boy hits town."
Baylis's previous TV credits include guest roles on Law and Order: UK, The Bill, Misfits and Sirens.
His first Coronation Street scenes will air in the summer. Get the Inside Soap magazine on your iPhone or iPad