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

It has been represented in the House of Representatives since 1987.

[3] The district consists of the city of Olongapo and adjacent municipalities in the southernmost part of Zambales, namely Castillejos, San Marcelino and Subic.

[4] It is currently represented in the 19th Congress by Jefferson F. Khongun of the Nacionalista Party (NP).

[5]