Sikakap is a sub-district on the Indonesian island of North Pagai, in the Mentawai Islands off Sumatra. The sub-district contains both Sikakap and Matobe, while Sikakap village incorporates the hamlets of Central Sikakap, East Sikakap and Sibaibai. Overall, the total population was 3,194 as of 2016. Also part of the sub-district is the Sikakap Strait between North and South Pagai, a designated Regional Marine Conservation Area. The Strait, an area of 3,960 hectares, has a coastal length of 19.79 kilometres (12.30 mi) and is a major contributor to West Sumatra's fishing industry.