The Negros Revolution, commemorated and popularly known as the Fifth of November or Negros Day, was a political movement that in 1898 created a government on Negros Island in the Philippines, ending Spanish control of the island and paving the way for a republican government run by the Negrense natives. The newly established Negros Republic lasted for approximately three months. American forces landed on the island unopposed on February 2, 1899, ending the island's independence. Negros was then annexed to the Philippine Islands on 20 April 1901.

Negros is the fourth largest and third most populous island in the Philippines, with a total land area of 13,309 km2 (5,139 sq mi). The coastal zone of the southern part of Negros is identified as a site of highest marine biodiversity importance in the Coral Triangle.