Zamboanga del Sur's 1st congressional district is one of the two congressional districts of the Philippines in the province of Zamboanga del Sur.

[3] The district encompasses the northern half of the province consisting of its provincial capital city of Pagadian and the municipalities of Aurora, Dumingag, Josefina, Labangan, Mahayag, Midsalip, Molave, Ramon Magsaysay, Sominot, Tambulig and Tukuran.

[4] It is currently represented in the 18th Congress by Divina Grace Yu of the Lakas–CMD.

Victor Yu is the incumbent but ineligible for reelection.

His party nominated his wife, Divina Grace Yu.