The Political Constitution of 1899, informally known as the Malolos Constitution, was the constitution of the First Philippine Republic. It was written by Felipe Calderón y Roca and Felipe Buencamino as an alternative to a pair of proposals to the Malolos Congress by Apolinario Mabini and Pedro Paterno. After a lengthy debate in the latter part of 1898, it was promulgated on January 21, 1899.

The Philippine Republic, now officially remembered as the First Philippine Republic and also referred to by historians as the Malolos Republic, was established in Malolos, Bulacan during the Philippine Revolution against the Spanish Empire (1896–1898) and the Spanish–American War between Spain and the United States (1898) through the promulgation of the Malolos Constitution on January 22, 1899, succeeding the Revolutionary Government of the Philippines. It was formally established with Emilio Aguinaldo as president. It maintained governance until April 1, 1901.