The Contras were the various U.S.-backed-and-funded right-wing rebel groups that were active from 1979 to 1990 in opposition to the Marxist Sandinista Junta of National Reconstruction Government in Nicaragua, which had come to power in 1979 following the Nicaraguan Revolution. Among the separate contra groups, the Nicaraguan Democratic Force (FDN) emerged as the largest by far. In 1987, virtually all Contra organizations were united, at least nominally, into the Nicaraguan Resistance.

A counter-revolutionary or an anti-revolutionary is anyone who opposes or resists a revolution, particularly one who acts after a revolution in order to try to overturn it or reverse its course, in full or in part. The adjective "counter-revolutionary" pertains to movements that would restore the state of affairs, or the principles, that prevailed during a prerevolutionary era.