Sin Piedad (2012) (Spanish for "No Mercy") was an annual professional wrestling major event produced by Consejo Mundial de Lucha Libre (CMLL), which took place on December 14, 2012 in Arena México, Mexico City, Mexico and replaced CMLL's regular Friday night show Super Viernes ("Super Friday"). The 2012 Sin Piedad was the eleventh event under that name that CMLL has promoted their last major show of the year, always held in December. The main event of the show was the finals of the 2012 2012 La Copa Junior Tournament between La Sombra and Tama Tonga, both second generation wrestlers. The show included five additional matches and would be the first major CMLL show promoted in Mexico since, the CMLL 67th Anniversary Show on September 29, 2000, to not feature a Lucha de Apuestas or bet match at all.

The Mexican wrestling company Consejo Mundial de Lucha Libre (Spanish for "World Wrestling Council"; CMLL) has held a number of major shows over the years using the moniker Sin Piedad ("No Pity" or "No Mercy"). CMLL has intermittently held a show billed specifically as Sin Piedad since 2000, primarily using the name for their "end of the year" show in December, although once they held a Sin Piedad show in August as well. CMLL has on occasion used a different name for the end-of-year show but Sin Piedad is the most commonly used name. All Sin Piedad shows have been held in Arena México in Mexico City, Mexico which is CMLL's main venue, its "home". Traditionally CMLL holds their major events on Friday Nights, which means the Sin Piedad shows replace their regularly scheduled Super Viernes show. The 2012 Sin Piedad show was the eleventh show to use the name.

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