Partick Thistle FC is a professional association football club from Glasgow, Scotland. Despite their name, the club is based in the Maryhill area of the city, and have not played in Partick since 1908. Partick Thistle was formed in 1876 in the burgh of Partick. In their early years, the side played in several places before moving to their present home, Firhill in 1909. In 1891 Partick Thistle joined the Scottish Football Alliance, one of several competitions set up immediately after the formation of the Scottish Football League in 1890. The club won the Second Division championship in 1897 and were elected to the First Division. The following season they were re-elected after finishing in eighth place. In 1900 they were elected back to the top level, having finished as Second Division champions again, but were relegated the following season and then promoted in second place in 1902.  It was during the 1902–03 Scottish Division One season that Thistle set their highest finish in the Scottish league structure, finishing 8th in the table. The Club laid claim to their first piece of major silverware in 1921, when they won the Scottish Cup, beating Rangers 1–0 in the final. Partick reached the final again nine years later, facing the same opposition, but Rangers won 2–1 in a replay following a 0–0 draw. Thistle enjoyed relative success in League competition during the 50s, 60s and 70s, finishing third in the top tier in 1948, 1954 and 1963. Most famously, however, in the season 1971-72, they overcame the huge favourites, Celtic in the League Cup Final. Taking a dramatic 4–0 lead, before eventually winning the match 4–1.  The clubs fortunes declined during the 1980s, and during the 1990s increasing financial problems threatened to put the club out of existence. In 1998, the club was close to going bankrupt, and it took a fan-based effort to keep them afloat with the "Save the Jags" campaign. 

In 2001 they won promotion and remarkably the following season they returned to the Scottish Premier League. They held on for three seasons until finishing bottom in 2004; relegated again the following season, they found themselves back in the Second Division, only to win promotion back to Scottish Division One (second level) after a dramatic play-off victory on penalties against Peterhead. Eight years after their return to Division One, Thistle won the 2012-13 title and returned to the top tier of what was now the Scottish Professional Football League. At the end of the 2017-18 season Thistle finished in 11th position, narrowly avoiding 12th place with Ross County being automatically relegated. Thistle subsequently went into the Scottish Premiership play-offs against Livingston, who had finished second in the Scottish Championship. They lost both legs of the play-offs and were relegated from Premiership after a five year stay.