List of Celtic F.C. seasons
Celtic Football Club is a Scottish professional association football club based in Parkhead, Glasgow. The club was founded in 1887 and played their first match in May 1888, a friendly match against Rangers. The club played their first competitive match in September 1888, when they entered the first round of the 1888–89 Scottish Cup, and were founding members of the Scottish Football League in 1890 from which they have remained in the top tier of ever since. Celtic have won the Scottish League Championship on 49 occasions, the Scottish Cup 38 times and the Scottish League Cup 17 times. The club enjoyed their greatest successes during the 1960s and 1970s under Jock Stein when they won nine consecutive league titles and the European Cup.
As of the end of the 2017–18 season, the club have played more than 120 seasons in Scottish football. The table details their achievements and the top goalscorer in senior major first-team competitions to the end of the most recently completed season. Details of the partially completed league campaign in the 1939–40 season, abandoned due to the Second World War, are also included.
Celtic played their first ever competitive match on 1 September 1888, a first round Scottish Cup tie against Shettleston, winning 5–1, and eventually reaching the final where they lost to Third Lanark after a replay. The team also made their debuts in the Glasgow Cup and the North-Eastern Cup that same season, reaching the semi-final of the Glasgow Cup where they lost to Queens Park, and defeating Cowlairs 6–1 in the final of the North-Eastern Cup to win their first ever trophy. The Scottish Football League was formed in 1890, and Celtic were among the founding members, finishing third behind joint-winner's Rangers and Dumbarton in the competition's inaugural season.
In 1891, Celtic won their second trophy when they beat Third Lanark 4–0 in the final of the Glasgow Cup. The following year saw Celtic winning their first major tournament, defeating Queen's Park 5–1 in the 1892 Scottish Cup Final. A first league title then followed in season 1892–93. The Glasgow Cup remained a prestigious tournament for some years, but declined in importance after the Second World War following the introduction of the Scottish League Cup and European club competitions. Celtic have since gone on to win the Scottish League Championship on 49 occasions, including a run of nine consecutive titles in the 1960s and 1970s, the Scottish Cup 38 times, and the Scottish League Cup 17 times.
Celtic first participated in European competition during the 1962–63 season, their third place finish in the league the previous season qualifying them for the Inter-Cities Fairs Cup. They went on to reach two European Cup Winner's Cup semi-finals in 1964 and 1966, before going on to become the first British club to win the European Cup in 1967, defeating Inter Milan 2–1 in the final. Celtic reached the European Cup Final again in 1970, but lost to Feyenoord. Their last appearance in a European final was in 2003 when they lost 3–2 to FC Porto in the UEFA Cup Final. 
- Goals noted for Top Goalscorer comprises goals scored in League, Scottish Cup, Scottish League Cup, Glasgow Cup and European Club competitions.
- The Scottish League Cup competition did not begin until 1946.
- European club competitions did not begin until 1955.
- 1908–09 Scottish Cup Final between Rangers and Celtic was abandoned due to a riot. The trophy was withheld.
- The competition was withdrawn due to the outbreak of the First World War.
- The 1939–40 season was suspended following the outbreak of the Second World War
- John Divers is listed as Celtic's top scorer for 1939-40, but this tally includes goals scored in the unofficial wartime competitions set up in the aftermath of the suspension of official football. Prior to the official season being suspended in October 1939, Frank Murphy was the top scorer.
- European club competitions did not begin until 1955.
- The Glasgow Cup becomes a youth team competition.
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