Sepaku (Indonesian pronunciation: [səˈpaku]) is a district of Penajam North Paser Regency, East Kalimantan, Indonesia.

[1] Sepaku is notable for being the site of the future national capital of Nusantara, although the local government claimed that only 10% to 20% of the current total area is being included.

[7][8] Sepaku was originally inhabited by Balik subgroup of Paser people, who migrated from neighbouring Balikpapan (Tanjung Gonggot).

[10] On 11 June 1996, following the enactment of the government regulation number 38, Sepaku was formed from the northern parts of Penajam, along with the formation of 12 others in East and North Kalimantan.

[11][12] Before being chosen for the site of the future Indonesian capital in 2019, there had been demands from the district to secede from PPU due to lags in development.