Suntarsky District (; , Suntaar uluuha, ) is an administrative and municipal district (raion, or ulus), one of the thirty-four in the Sakha Republic, Russia. It is located in the western central part of the republic and borders with Nyurbinsky District in the north and northeast, Verkhnevilyuysky District in the east, Olyokminsky District in the southeast, Lensky District in the southwest, and with Mirninsky District in the west. The area of the district is . Its administrative center is the rural locality (a selo) of Suntar. Population: 25,485 (2002 Census); The population of Suntar accounts for 39.9% of the district's total population.
The main river in the district is the Vilyuy.
Average January temperature ranges from and average July temperature ranges from . Annual precipitation is about .
The district was established on January 9, 1930.
As of the 2021 Census, the ethnic composition was as follows:
The economy of the district is mostly based on agriculture. There are deposits of gold, brown coal, gypsum, anhydrite, construction materials, and others minerals.
The Vilyuy Highway runs through the district, connecting it with Yakutsk, Vilyuysk, and Mirny. There is an airport in Suntar.
<small>Divisional source:</small><br /> <br/> <small>*Administrative centers are shown in bold</small>