 Most of Middlesbrough's League existence has been in the top two tiers; they were relegated to the Third Division twice in 1966 and 1986, but each time they bounced back as runners-up the following season.This list details the club's achievements in all competitions, and the top scorers for each season.Records of competitions such as the North Riding Senior Cup are not included due to them being played against lower league opposition and reserve sides.