Foundation Day of Davao Occidental is observed in the province of Davao Occidental in the Philippines every October 28. This special non-working holiday commemorates the day Davao Occidental officially separated from Davao del Sur. The province was created following a successful plebiscite in 2013, with over 76% of voters approving its establishment. Celebrations include cultural festivals, art exhibitions, and various contests organized by the provincial government. The history of the region dates back to ancient times, with influences from indigenous tribes and later colonization by the Spanish in the mid-19th century. In November 2018, the founding anniversary was designated as a holiday by President Rodrigo Duterte, further emphasizing its significance in the local culture.