Impulsora del Deportivo Necaxa S.A. de C.V. (pronounced [ne.ˈkaɣ.sa]); often simply known as Club Necaxa, is a Mexican professional football club based in Aguascalientes. It competes in Liga MX, the top division of Mexican football. It was founded on August 21, 1923 in Mexico City by the Scottish-born engineer William H. Frasser. In 2003, it changed its headquarters to the city of Aguascalientes, in the state of the same name. The team plays its home games at Estadio Victoria.

The club has 12 titles in its record (three in the League, four in the Mexico Cup, two in the Champion of Champions, one in the Mexican Super Cup, one in the CONCACAF Champions Cup and one in the CONCACAF Cup Winners Cup), as well as well as four Promotion League titles and two as winners of the promotion series. It was the first team to win the double in Mexico, winning the League and the Cup in the same season, this in 1932-33, thus taking the nickname Campeonísimo, becoming the first team in Mexican football to carry that nickname.

At the international level and beyond its confederation titles, the club's most notable performance was obtaining third place in the 2000 FIFA Club World Championship held in Brazil.

It occupies 7th place in the list of the International Federation of Football History and Statistics of the Club of the Century of North and Central America (1901-2000), being the best-placed Mexican club.