Don Marcelino, officially the Municipality of Don Marcelino, is a municipality in the province of Davao Occidental, Philippines. According to the 2020 census, it has a population of 45,540 people. Don Marcelino is named in honor of Marcelino Maruya, who served as the first municipal mayor of the mother municipality of Malita, appointed by President Manuel L. Quezon in 1936. The name incorporates the honorific title Don.