Monkayo, officially the Municipality of Monkayo (Cebuano: Lungsod sa Monkayo; Filipino: Bayan ng Monkayo), is a 1st class municipality in the province of Davao de Oro, Philippines. According to the 2020 census, it has a population of 93,937 people, making it the most populous town in the province. Monkayo is an agricultural town, with vast tracts of land planted to rice and banana. The municipality is also host to the gold-rich barangay of Mount Diwata, popularly known as "Diwalwal" (which in the local dialect means one's tongue is hanging out due to exhaustion), a 1,000-meter high range known for its rich gold ore deposit.
Monkayo's seat of government is located in Barangay Poblacion.