The 2012–13 Top 14 competition was a French domestic rugby union club competition operated by the Ligue Nationale de Rugby (LNR). Two new teams from the 2011–12 Pro D2 season were promoted to Top 14 this year, Grenoble and Stade Montois in place of the two relegated teams, CA Brive and Lyon OU. Home-and-away play began on 17 August 2012 and continued through to 5 May 2013. The regular season was followed by a three-round playoff involving the top six sides. The final was contested at the Stade de France between Toulon and Castres; the match was won 19–14 by Castres to earn them their first title since the controversial final in 1993.

The Top 14 is a professional rugby union club competition that is played in France. Created in 1892, the Top 14 is at the top of the national league system operated by the France National Rugby League, also known by its French initialism of LNR. There is promotion and relegation between the Top 14 and the next level down, the Rugby Pro D2. The fourteen best rugby teams in France participate in the competition, hence the name Top 14. The competition was previously known as the Top 16.