The Republic of the Rif (Arabic: جمهورية الريف Jumhūriyyatu r-Rīf) was a confederate republic in the Rif, Morocco, that existed between 1921 and 1926. It was created in September 1921, when a coalition of Rifians and Jebala led by Abd el-Krim revolted in the Rif War against the Spanish protectorate in Morocco. The French would intervene on the side of Spain in the later stages of the conflict. A protracted struggle for independence killed many Rifians and Spanish–French soldiers, and witnessed the use of chemical weapons by the Spanish army—their first widespread deployment since the end of the World War I. The eventual Spanish–French victory was owed to the technological and manpower advantages despite their lack of morale and coherence. Following the war's end, the Republic was ultimately dissolved in 1926.

The French and Spanish empires both colonized Morocco, and in 1912 the Treaty Between France and Spain Regarding Morocco established Spanish and French protectorates there.

France's general approach to governing the protectorate of Morocco was a policy of indirect rule, where they co-opted existing governance systems to control the protectorate. Specifically, the Moroccan elite and the sultans of Morocco were both left in control while being strongly influenced by the French government.

French and Spanish colonialism in Morocco was discriminatory against the native Rifians and Sahrawis and was highly detrimental to the Moroccan economy. Moroccans were treated as second-class citizens and discriminated against in all aspects of colonial life.

Infrastructure was discriminatory in colonial Morocco. The French colonial government built 36.5 kilometers of sewers in the new neighborhoods created to accommodate new French settlers, while only 4.3 kilometers of sewers were built in indigenous Moroccan communities. Additionally, land in Morocco was far more expensive for Moroccans than for French settlers. For example, while the average Moroccan had a plot of land 50 times smaller than their French settler counterparts, Moroccans were forced to pay 24% more per hectare. Moroccans were additionally prohibited from buying land from French settlers.

Colonial Morocco's economy was designed to benefit French businesses at the detriment of Moroccan laborers. Morocco was forced to import all of its goods from France despite higher costs. Additionally, improvements to agriculture and irrigation systems in Morocco exclusively benefited colonial agriculturalists while leaving Moroccan farms at a technological disadvantage. It is estimated that French colonial policies resulted in 95% of Morocco's trade deficit by 1950.

Following the allowance of its interests and recognition of its influence in northern Morocco through the 1904 Entente Cordiale, 1906 Algeciras Conference and 1907 Pact of Cartagena, Restoration-era Spain occupied Ras Kebdana, a town near the Moulouya River, in March 1908 and launched the Melillan and Kert campaigns against the Riffian tribes between 1909 and 1912. In June 1911, Spanish troops occupied Larache and Ksar el-Kebir.

The Moroccan independence president Abd el-Krim (1882–1963) organized an armed revolution, the Rif War, against the Spanish and French colonial control of Morocco. The Spanish had faced unrest off and on from the 1890s, but in 1921 Spanish colonial troops were massacred at the Battle of Annual. Abd el-Krim founded an independent Republic, the Rif Republic, which operated until 1927 but had no formal international recognition.

France and Spain did not recognize the Republic and collaborated to destroy it. They sent in 200,000 soldiers, forcing Abd el-Krim to surrender in 1926. He was exiled in the Pacific until 1947. Morocco became quiet, and in 1936 became the base from which Francisco Franco launched the fascist coup of July 1936.

In 1921, local Rifians, under the leadership of Abd el-Krim, crushed a Spanish offensive led by General Manuel Fernández Silvestre at the Battle of Annual, and soon after declared the creation of an independent republic on 18 September 1921. The republic was formally constituted in 1923, with Abd el-Krim as head of state, and Ben Hajj Hatmi as prime minister.

Abd el-Krim handed the Spanish numerous defeats, driving them back to coastal outposts. With the war ongoing, he sent diplomatic representatives to London and Paris, in an ultimately futile attempt to establish legitimate diplomatic relations with other European powers.

In late 1925, the French and Spanish created a joint task force of 500,000 men, supported by tanks and aircraft. After 1923, the Spanish employed the use of chemical weapons imported from Germany. The Republic was dissolved by Spanish and French occupation forces on 27 May 1926, but many Rif guerrillas continued to fight until 1927.

In April 1925, Abd el-Krim proclaimed the independent Republic in the Rif region of Spanish Morocco. He advanced south into French Morocco, defeating French forces and threatening the capital, Fes. The resident-general, Hubert Lyautey, was replaced as military commander by Philippe Pétain on 3 September 1925. On 11 October 1925, Théodore Steeg replaced Lyautey as resident-general with the mandate of restoring peace and making the transition from military to civilian government. Lyautey received very little recognition for his achievement in securing Morocco as a colony. Steeg would have been willing to give autonomy to the people of the Rif, but was overruled by the army.

Abd el-Krim surrendered to Philippe Pétain on 26 May 1926 and was deported to Réunion in the Indian Ocean, where he was held until 1947. Théodore Steeg said Abd el-Krim was a great leader and national and folk hero, but Abd el-Krim wanted "neither [to be] exalted nor humiliated, but in time forgotten."

• Spanish use of chemical weapons in the Rif War

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