The Mexican National Middleweight Championship, or Campeonata Nacional Medio as it’s known as in Spanish, is a wrestling championship for "Middleweight" wrestlers. The title is a "national" level title, a mid-card title that’s sanctioned by the "Comisión de Box y Lucha Libre Mexico D.F." (the Mexican Boxing and Wrestling commission). The Mexican National Middleweight Championship has been defended exclusively in the Mexican wrestling promotion Asistencia Asesoría y Administración (AAA) since AAA was founded in 1992.