This is a list of seasons played by Middlesbrough Football Club in English and European football, from 1883, when the club first entered the FA Cup, to the most recent completed season. Middlesbrough Football Club were founded on 18 February 1876, by members of Middlesbrough Cricket Club. For the first years of their existence Middlesbrough participated in competitions such as the Sheffield Cup and the Cleveland Association Challenge Cup. The club have won only one major trophy in their professional history, the Football League Cup in 2004. 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.