Belligerents:

United States
Cuban separatists
Puerto Rican separatists
Katipunan
          Officially, Kataas-taasang, Kagalang-galangang Katipunan ng̃ mg̃á Anak ng̃ Bayan
          (in English: High and Honorable Society of the Children of the Nation)
          (in Spanish: Suprema y Venerable Asociación de los Hijos del Pueblo)
Kingdom of Spain