Goyang A (Korean: 고양시 갑) is a constituency of the National Assembly of South Korea.

[1] Goyang A is widely regarded as a progressive and liberal stronghold constituency, as the area has consistently elected members of center-left political parties except for the 2008 South Korean legislative election.

[2] From 2016 to 2024, the constituency was represented by Justice Party leader Sim Sang-jung.

It was also the only regional single-member constituency represented by the Justice Party in the National Assembly until 2024.

[3] Sim was succeeded by Kim Sung-hoi of the Democratic Party after being defeated by a wide margin in the 2024 South Korean legislative election.