Lanao del Sur's 1st congressional district is a congressional district in the province of Lanao del Sur that has been represented in the House of Representatives of the Philippines since 1987. It covers the eastern interior municipalities bordering the provinces of Bukidnon and Cotabato as well as those along the northern shores of Lake Lanao including its capital city, Marawi. The district is currently represented in the 19th Congress by Ziaur-Rahman A. Adiong of Lakas-CMD.