|Full name||Castres Olympique|
|Ground(s)||Stade Pierre-Fabre (Capacity: 12,500)|
Castres Olympique (French pronunciation: [kastʁ ɔlɛ̃pik]) is a French rugby union club located in the Occitanian city of Castres and is currently competing in the top level of the French league system.
The team won five French top-division championships in 1949, 1950, 1993, 2013, and 2018 as well as one Coupe de France in 1948.
In 1898 several alumni of Castres' municipal college met in a city centre bar and decided to create a team allowing them to play their favourite sport, rugby union. For the first few years this team was part of a multisport club until 1906. Unhappy with the dominating position cycling had within the club, the members of the rugby section decided to leave and create a club of their own, solely dedicated to their sport. It was decided that this club would be named Castres Olympique and its colours would be changed from yellow and black to its current blue, white and grey.
The new club reached the top flight after only 15 years of existence and has remained there ever since, bar for a couple of years during the 80s when the club was in the then Section B of the 1st division. The club has never left the 1st division since 1921.
For a while Castres Olympique would experience mixed fortunes until 1948 when they reached and won their first Coupe de France. The prestigious championship would follow a year later, and again in 1950.
From the 1960s the club would experience a stream of mediocre seasons and steady decline until Pierre Fabre, the founder of a local pharmaceutical company, decided to take over the club and restore it to its former relative glory in 1988.
The 1992–93 French Rugby Union Championship was won by Castres who beat Grenoble 14–11 in the final, but a try of Olivier Brouzet is denied to Grenoble and the decisive try by Gary Whetton was awarded by the referee, Daniel Salles, when in fact the defender Franck Hueber from Grenoble touched down the ball first in his try zone. This error gave the title to Castres. Salles admitted the error 13 years later.
The club reached the final again in 1995 losing to Toulouse.
The team's owner, Pierre Fabre, the founder of Laboratoires Pierre Fabre. died on 20 July 2013. Castres' home stadium, previously known as Stade Pierre-Antoine, was renamed in his memory during ceremonies in conjunction with Castres' match with Montpellier on 9 September 2017.
|22 May 1949||Castres Olympique||Stade Montois||14-3 1||Stade des Ponts Jumeaux, Toulouse||23,000|
|16 April 1950||Castres Olympique||Racing Club de France||11-8||Stade des Ponts Jumeaux, Toulouse||25,000|
|5 June 1993||Castres Olympique||FC Grenoble||14-11||Parc des Princes, Paris||48,000|
|6 May 1995||Stade Toulousain||Castres Olympique||31-16||Parc des Princes, Paris||48,615|
|1 June 2013||Castres Olympique||RC Toulon||19-14||Stade de France, Saint-Denis||80,033|
|31 May 2014||RC Toulon||Castres Olympique||18-10||Stade de France, Saint-Denis||80,174|
|2 June 2018||Castres Olympique||Montpellier||29-13||Stade de France, Saint-Denis||78,441|
|Club||Played||Won||Drawn||Lost||Points For||Points Against||Points Diff.||Tries For||Tries Against||Try Bonus||Losing Bonus||Points|
If teams are level at any stage, tiebreakers are applied in the following order:
|Green background (rows 1 and 2) receive semi-final play-off places and receive berths in the 2020–21 European Rugby Champions Cup.|
Blue background (rows 3 to 6) receive quarter-final play-off places, and receive berths in the Champions Cup.
Plain background indicates teams that earn a place in the 2020–21 European Rugby Challenge Cup.
Pink background (row 13) will qualify to the Relegation play-offs.
Red background (row 14) will automatically be relegated to Rugby Pro D2.
Final table — source: 
Note: Flags indicate national union as has been defined under WR eligibility rules. Players may hold more than one non-WR nationality.