Plastic pollution in the ocean is an emerging environmental concern in the Philippines. This study was conducted to investigate the prevalence of macroplastics, composition of plastic litter, and the clean-coast index (CCI) of urban and rural beaches in Sarangani Bay. Plastic litter was collected by delineating a 100-m transecting line with three 4 m × 4 m quadrats. The density of macroplastic litter in urban areas (0.66 items m⁻²) was significantly higher than in rural areas (0.29 items m⁻²). The plastics sampled were predominantly food packaging, such as polyethylene bags, which are locally known as sando bags. The accumulation rate of macroplastic litter ranged from 0.07 items d⁻¹ m⁻² to 0.40 items d⁻¹ m⁻², in which urban beaches (0.25 items d⁻¹ m⁻²) have a significantly higher accumulation rate than rural beaches (0.11 items d⁻¹ m⁻²). Overall, the calculated CCI of the beaches of Sarangani Bay was categorized as clean to moderately clean for rural beaches and moderately clean to extremely dirty for urban beaches.