Oido station is a subway station on Seoul Subway Line 4 and the Suin–Bundang Line in Siheung, South Korea. It is the current southwestern terminus of Seoul Subway Line 4 located almost 30 kilometers southwest of Seoul, connecting Oido to other parts of Korea. A commuter rail trip between this station and Seoul Station takes over an hour, and a train servicing depot is located nearby. The name of the station was decided by the surrounding area Oido island.

Seoul Subway Line 4 of the Seoul Metropolitan Subway is a long line crossing from the southwest to the northeast across the Seoul National Capital Area. The central section in Seoul City is operated by Seoul Metro with some trains offering through service to Korail's Ansan and Gwacheon Lines. The southern terminus (Oido) is in Jeongwang 4-dong, Siheung City, and the northern terminus (Jinjeop) is in Jinjeop-eup, Namyangju-si, Gyeonggi-do; the newly built northern section is correspondingly owned by a company owned by Namyangju-si, with operations contracted to Seoul Metro. In 2022, the Seoul Metro operated section had an annual ridership of 219,587,000 or about 601,608 passengers per day.