Ilsanseo District (Korean: 일산서구; RR: Ilsanseo-gu; lit.

West Ilsan District) is a district in Goyang, Gyeonggi-do, South Korea.

Ilsan-gu was divided into Ilsandong District and Ilsanseo District on May 16, 2005.

Ilsanseo District is divided into 9 dong (동, "neighborhoods"): Ilsanseo District has 46 schools including: 22 elementary schools, 12 middle schools, 9 high schools, and 2 special schools.

[1] Hugok (후곡) is notable for their hagwons (학원, "cram school"), and many hagwons are present in the region.