Since the 1990s Korea has emerged as one of the major migration destinations in Asia. This paper represents one of the first attempts to examine the determinants of bilateral labor migration to Korea across source countries and over time. We analyze the effects of economic, demographic, and policy factors. We also examine the role played by trade between Korea and origin countries. The results suggest that economic fundamentals, including income level in Korea, as well as demographic factors both in origin countries and Korea, play an important role, while different patterns are observed for skilled and unskilled migrant workers. We also found that trade is an important predictor of the size and composition of foreign migrant population in Korea. We speculate that trade influences migration to Korea through the information effect and foreign labor policy channel.