McGoohan attended St Vincent's School and De La Salle College in Sheffield. During World War II, he was evacuated to Loughborough, Leicestershire. There he attended Ratcliffe College, where he excelled in mathematics and boxing. McGoohan left school at the age of 16 and returned to Sheffield, where he worked as a chicken farmer, a bank clerk and a lorry driver before getting a job as a stage manager at Sheffield Repertory Theatre. When one of the actors became ill, McGoohan was substituted for him, launching his acting career.