Lak Si is one of the 50 districts, or khet, located in Bangkok, Thailand. It serves as a geographical administrative division within the capital city.
The district is bounded by several neighboring areas, including Don Mueang, Bang Khen, and Chatuchak within Bangkok. It also shares borders with the Nonthaburi province, specifically bordering the districts of Mueang Nonthaburi and Pak Kret.