Constitución railway station is a large railway station in Constitución, a barrio in central Buenos Aires, Argentina. The full official name of the station is Estación Plaza Constitution reflecting the fact that the station is located opposite Constitution Square, two kilometers to the south of the Obelisco landmark. The ground floor of the station has fourteen tracks and the floor below has two tracks for the Buenos Aires Underground.

Constitución is a barrio or neighborhood of Buenos Aires, Argentina, approximately two kilometers south of downtown.