The Battle of Annual was fought on July 22, 1921 at Annual, in North eastern Morocco, between the Spanish Army and Rifian Berbers during the Rif War. The Spanish suffered a major military defeat, which is almost always referred to by the Spanish as the Disaster of Annual (Spanish: Desastre de Annual) which is widely considered to be the worst defeat suffered by the modern Spanish Army.

It led to major political crises, the fall of several governments, a military dictatorship, the abdication of King Alfonso XIII and a complete redefinition of Spanish colonial policy toward the Rif as the entire Spanish colonial enterprise was at one point threatened.