Tokyo Station (Japanese: 東京駅, Hepburn: Tōkyō-eki; pronounced [to̞ːkʲo̞ːe̞kʲi]) is a major railway station in Chiyoda, Tokyo, Japan. The original station is located in Chiyoda's Marunouchi business district near the Imperial Palace grounds. The newer Eastern extension is not far from the Ginza commercial district. Due to the large area covered by the station, it is divided into the Marunouchi (west) and Yaesu (east) sides in its directional signage.

The station opened in 1914 as an integrated terminus for the present-day Tōkaidō Line, Tōhoku Line, and later the Chūō Line, which previously had separate termini in Tokyo. Since then, it has served as the main terminus for inter-city trains departing Tokyo westwards. The station was badly damaged during the Bombing of Tokyo on 25 May 1945 but soon resumed service. The Tōkaidō Shinkansen, the world’s first dedicated high-speed rail system, opened between the station and Osaka in 1964. With the extension of northbound Shinkansen lines from Ueno in 1991, the station also became a gateway to northeast Japan.

Served by the high-speed rail lines of the Shinkansen network, Tokyo Station is the main inter-city rail terminal in Tokyo. It is the busiest station in Japan in terms of scheduled trains, with more than 4,000 trains arriving and departing daily, and the fifth-busiest in eastern Japan in terms of passenger throughput; on average, more than 500,000 people use Tokyo Station every day. The station is also served by many regional commuter lines of Japan Railways, as well as the Tokyo Metro network.

Tokyo Station serves as the interchange station for both conventional and Shinkansen lines. The station is served by many railway lines operated by JR East. For conventional lines, the station is the terminus of the Tōkaidō Main Line, the Chūō Main Line, Keiyō Line, and the Sōbu Main Line. The station is also served by the Ueno–Tokyo Line, Keihin–Tōhoku Line, Yamanote Line, rapid services of Sōbu Line and Yokosuka Line.

The station is also directly connected to two Shinkansen lines, the Tōhoku Shinkansen and Tokaido Shinkansen operated by JR Central. Shinkansen trains from other lines also service the station via these two lines. The services from Yamagata Shinkansen, Akita Shinkansen, which are Mini-Shinkansen lines, connect to Tokyo Station via the Tōhoku Shinkansen. Hokkaido Shinkansen services operated by JR Hokkaido also run on Tohoku Shinkansen tracks to service Tokyo Station.

The station is linked by underground passageways to the Ōtemachi underground (subway) station complex served by the Tōzai, Chiyoda, Hanzōmon, and Mita subway lines.

It is also possible to walk to the Nijūbashimae, Hibiya, Yūrakuchō, Ginza, and Higashi-ginza Stations completely underground (the last a distance of over 2 km (1.2 mi)), but these stations can usually be reached more quickly by train.

Tokyo Station is also a major intercity bus terminal, with regular midday service to several cities in the Kantō region and overnight service to the Kansai and Tōhoku regions. The furthest overnight bus service goes to Izumo-Taisha, over 800 km (500 mi) away.