This article chronicles the seasons of Derby County Football Club from their formation in 1884 to the present day.
Details of Derby County's final league position is given (from the 1888–99 season, when The Football League was founded), along with which round they made it to in both the FA Cup, the EFL Cup (which began in the 1960–61 season) and any European competitions that Derby had qualified for.
^At the beginning of the 1892–93 season, the Football League expanded to include a second division; the existing division (which Derby were playing in) was renamed the First Division.
^Derby qualified for the Fairs Cup, but were banned from competing due to financial irregularities.
^At the beginning of the 1981–82 season, the Football League changed the points system from two to three points for a win.
^At the beginning of the 1958–59 season, the Football League's Third Division (North) and Third Division (South) were replaced by a national Third Division and a national Fourth Division; therefore, Derby competed in the national Third Division upon relegation in 1984.
^Had English clubs not been banned from competing in European competition, Derby would have taken part in the UEFA Cup in the 1989–90 season.
^At the beginning of the 1992–93 season, the clubs in the Football League First Division broke away to form the FA Premier League; as a result, the Football League's three remaining divisions were renamed: the Second Division (which Derby were playing in) became the First Division, the Third Division became the Second Division and the Fourth Division became the Third Division.
^At the beginning of the 2004–05 season, the Football League renamed its divisions: the First Division (which Derby were playing in) became The Championship, the Second Division became League One and the Third Division became League Two.