Acre War
Bolivia in 1899 before entering the war.
Date 1899–1903 Location Acre, Brazil Result Brazilian victory; Treaty of Petrópolis
Belligerents
Bolivia	Brazil
Commanders and leaders
José Manuel Pando Federico Román Nicolás Suárez Callaú Bruno Racua	Manuel Ferraz de Campos Sales Francisco de Paula Rodrigues Alves Luis Gálvez Rodríguez de Arias José Plácido de Castro Jefferson José Torres Olímpio da Silveira
Strength
Unknown	Unknown
Casualties and losses
Unknown	Unknown

The Acre War, known in Brazil as Revolução Acreana ("Acreano Revolution" in Portuguese) and in Spanish as la Guerra del Acre ("The War of the Acre") was a border conflict between Bolivia and the First Brazilian Republic over the Acre Region, which was rich in rubber and gold deposits. The conflict had two phases between 1899 and 1903 and ended with a Brazilian victory and the subsequent Treaty of Petrópolis, which ceded Acre to Brazil. The outcome also affected territories disputed with Peru.

The region of Acre posessed rich gold deposits, an abundance of timber resources, principally rubber trees. From the end of the 19th century until the middle of the 20th century, rubber trees were crucial to the automobile and transport industry, as synthetic rubber for the manufacture of tires and other objects was not discovered until around World War II. It is because of this that the war is also referred to as the Rubber War (Guerra del Caucho), as one of the motives that drove Governor Jefferson José Torres of Amazonas (Brazilian state), was a rubber export tax.

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• Official Brazilian map from 1873, recognizing Acre as Bolivian or Peruvian.
• Cap. Arthur Posnansky and the Acre War: Biblioteca EEADV
• La Guerra del Acre: Los Tiempos newspaper
• La Guerra del Acre: Huellas de Bolivia
• Guerra del Acre: Eduardo Ginacarli
• La Guerra del Acre: El Deber newspaper