Sin Piedad (2008) (Spanish for "No Mercy") was a professional wrestling pay-per-view (PPV) produced by Consejo Mundial de Lucha Libre (CMLL), which took place on August 29, 2008 in Arena Mexico, Mexico City, Mexico. The 2008 Sin Piedad was the seventh event under that name that CMLL promoted as their last major show of the year, always held in December. The main event was Six-man "Lucha Libre rules" tag team match between Blue Panther, Dos Caras Jr. and Dr. Wagner Jr. and the team of Black Warrior, Mr. Niebla and Rey Bucanero. The show also featured two Lucha de Apuesta matches, the first one saw La Amapola and Lady Apache put their hair on the line. The second match saw Dragón Rojo Jr. and Mictlán both risk their masks. The show also featured three further six-man "Lucha Libre rules" tag team matches,including one featuring wrestlers from Total Nonstop Action Wrestling (TNA) and another featured CMLL's Mini-Estrellas division.

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 2008 Sin Piedad show was the eight show to use the name, and the only one to be held in August.

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