International Centre of Orthodox Trotskyism

The International Centre of Orthodox Trotskyism (Centro Internacional del Trotskismo Ortodoxo in Spanish, or CITO) was a Trotskyist international grouping. It split from the International Workers League (Fourth International) in 1994, and claimed to follow in the tradition of Nahuel Moreno.

In 2005, CITO dissolved after several member groups decided to rejoin the International Workers' League. The remaining groups decided to establish a new grouping called the International Socialist League.

Prior to its dissolution CITO consisted of the following groups:
 * Partido de la Revolución Socialista (Argentina)
 * Comité Iniciativa Obrera Socialista, (Argentina)
 * Partido Socialista de los Trabajadores (Colombia)
 * Partido Revolucionario de los Trabajadores (Costa Rica)
 * Partido de los Trabajadores, (Honduras)
 * Organización Socialista Revolucionaria de los Trabajadores, (Mexico)
 * Partido Revolucionario de los Trabajadores (Nicaragua)
 * Partido Socialista de los Trabajadores (Paraguay)