Waru is a district of Penajam North Paser Regency, in East Kalimantan, Indonesia. As of 2023, it was inhabited by 20,965 people, and currently has a total area of 553.38 km<sup>2</sup>. Its district seat is located at the village of Waru.
The district borders Penajam to the north, Babulu to the southwest, and Long Kali (Paser) to the west. It is also named after the tree Hibiscus tiliaceus (), for being abundant along what is now the PenajamâÂÂBabulu provincial road.
Waru is divided into the following 4 villages (the rest are rural , urban is marked by grey background):
The village of Bangun Mulya was split from Waru on 14 April 2010.