Isabela's 6th congressional district is one of the six congressional districts of the Philippines in the province of Isabela. It has been represented in the House of Representatives of the Philippines since 2019. The district consists of the city of Cauayan and the municipalities of Echague, San Guillermo, and San Isidro. It is currently represented in the 20th Congress by Faustino Dy III of the Partido Federal ng Pilipinas (PFP). Dy has also served as the House Speaker since September 2025.