Sin Piedad (2019) was a major professional wrestling event produced by the Mexican Lucha Libre promotion Consejo Mundial de Lucha Libre (CMLL). The 2019 Sin Piedad show was held on January 1, the fourth successive year that CMLL had held the show on New Year's Day, in Arena México, Mexico City, Mexico.

The Mexican professional wrestling promotion Consejo Mundial de Lucha Libre (CMLL) has traditionally held an annual Reyes del Aire tournament since 2005. There was no tournament in 2010 and both 2007 and 2012 saw two Reyes del Aire tournaments. The tournament includes a varying number of wrestlers, competing in a Torneo cibernetico match, essentially a multi-man elimination match with the last competitor remaining is declared that year's Rey del Aire and is given a trophy. CMLL holds a similar tournament for their Mini-Estrella division called Pequeños Reyes del Aire. Being a professional wrestling tournament, it is not won legitimately; it is instead won via predetermined outcomes to the matches that are kept secret from the general public.