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Sintang Regency is a regency of West Kalimantan province of Indonesia. It covers an area of 18,517.85 km2, and had a population of 364,759 at the 2010 Census and 421,306 at the 2020 Census; the official estimate as at mid 2025 was 449,211 (comprising 231,411 males and 217,800 females).

Sintang Regency is one of the few Indonesian regencies having a land border with another country (in this case, with Malaysia). It is also the third largest regency in the province by land area after Kapuas Hulu Regency and Ketapang Regency. The regency was formerly the site of the Sintang Kingdom, a Hindu kingdom that later converted to Islam and which was a regional power in the interior of Borneo Island. The regency seat is located at the large town of Sintang, which with over 87,000 residents in mid 2025, is among the biggest settlements in Borneo's interior alongside Putussibau and Puruk Cahu.

Somewhere between 45,000 and 39,000 B.C. the Sintang area was first inhabited by humans. The area changed hands several times from the Majapahit to the Bruneian Sultanate, but the local State of Sintang was ruled by Princes, who became Sultans when converted to Islam in 1672. When the Dutch arrived at Borneo in 1776 the area was quickly occupied by the Dutch.

The area was occupied by the Empire of Japan in 1941 as a result of WW2, and then was liberated in 1945. This was followed by Indonesian Independence.

Sintang, the seat of the regency has a tropical rainforest climate (Af) with heavy to very heavy rainfall year-round.