|Transit type||Rapid transit|
|Number of lines||13|
|Number of stations||285|
|Daily ridership||Tokyo Metro：7.579 million（2018）|
Toei Subway：3.207 million（2018） 
|Began operation||December 30, 1927|
|Operator(s)||Tokyo Metro Co., Tokyo Metropolitan Bureau of Transportation (Toei)|
|System length||304.1 km (189.0 mi)|
|Track gauge||1,067 mm (3 ft 6 in), 1,435 mm for Ginza, Marunouchi, Toei Asakusa & Toei Ōedo Lines, 1,372 mm for Toei Shinjuku Line|
The Tokyo subway (東京の地下鉄, Tōkyō no chikatetsu) is a part of the extensive rapid transit system that consists of Tokyo Metro and the Toei Subway in the Greater Tokyo area of Japan. While the subway system itself is largely within the city center, the lines extend far out via extensive through services onto suburban railway lines.
There are two primary subway operators in Tokyo:
- Tokyo Metro – Formerly a statutory corporation called the Teito Rapid Transit Authority (TRTA), it was converted into a kabushiki gaisha ( joint-stock company) in 2004. It currently operates 180 stations on nine lines and 195.0 kilometers (121.2 mi) of route. 
- Toei Subway – run by the Tokyo Metropolitan Bureau of Transportation, an agency of the Tokyo Metropolitan Government. It operates 106 stations on four lines and 109.0 kilometers (67.7 mi) of route. 
As of 2020 [update], the combined subway network of the Tokyo and Toei metros comprises 286 stations and 13 lines covering a total system length of 304.0 kilometers (188.9 mi). The Tokyo Metro and Toei networks together carry a combined average of over eight million passengers daily.  Despite being ranked first in worldwide subway usage, subways make up a small fraction of heavy rail rapid transit in Tokyo alone—only 286 out of 938 railway stations, as of 2020.  The Tokyo subway at 8.7 million daily passengers only represents 22% of Tokyo's 40 million daily rail passengers (see Transport in Greater Tokyo).  Other urban commuter rail systems include Keikyu Corporation (formerly the Keihin Electric Express Railway), Keio Corporation, Keisei Electric Railway, Odakyu Electric Railway, Seibu Railway, Tobu Railway and Tokyu Corporation.
|Marunouchi Line Branch Line||丸ノ内線分岐線|
|Sky Blue||Tōzai Line||東西線|
In addition, but not formally designated as subways:
- The Tokyo Waterfront Area Rapid Transit (TWR) operates a single mostly-underground line with eight stations, and 200,200 daily passengers in 2010. 
- The Saitama Rapid Railway Line, which is essentially an extension of the Tokyo Metro Namboku Line, operates a single mostly-underground line with eight stations.
- The Tōyō Rapid Railway Line, which is essentially an extension of the Tokyo Metro Tōzai Line, operates a single underground/elevated line with nine stations.
- The Yamanote Line is not a subway line, but a surface commuter loop line which operates with metro-like frequencies. It is owned by JR East. It acts as a key transportation artery in central Tokyo, and is often marked on Tokyo subway maps.
The Yokohama Subway and the Minatomirai Line also operate in the Greater Tokyo Area, but they are not directly connected to the Tokyo subway network. However, direct through services from the Tokyo Metro Fukutoshin Line regularly run into Yokohama's Minatomirai Line via the Tōkyū Tōyoko Line railway. On special occasions, typically around holidays, the Tokyo Metro Hibiya Line and Namboku Line operate special Minatomirai (みなとみらい号 ?), formerly known as Yokohama Mirai (横浜みらい号 ?), direct through services to the Minatomirai Line.
- 1915: Japan's first underground railway opened under Tokyo Station. It was only for the railway post office, not for passengers.[ citation needed]
- 1927: Tokyo Underground Railway Co., Ltd. (東京地下鉄道株式会社, Tōkyō Chika Tetsudō Kabushiki Gaisha) opened Japan's first underground line of the subway Ginza Line on December 30, 1927, and publicized as "the first underground railway in the Orient." The distance of the line was only 2.2 km between Ueno and Asakusa.
- 1938: Tokyo Rapid Transit Railway Co., Ltd. (東京高速鉄道株式会社, Tōkyō Kōsoku Tetsudō Kabushiki Gaisha) opened its subway system between Aoyama 6-chome (present-day Omotesando) and Toranomon.
- 1939: Tokyo Rapid Transit Railway extended its line from Toranomon to Shimbashi, and started an reciprocal operation with Tokyo Underground Railway.
- 1941: During World War II, the two subway companies merged under the name Teito Rapid Transit Authority (帝都高速度交通営団, Teito Kōsokudo Kōtsu Eidan) by the local government.
- 1954: The Marunouchi Line, the first subway line after World War II, opened between Ikebukuro and Ochanomizu.
- 1960: Toei Subway Line 1, present-day Toei Asakusa Line, opened between Oshiage and Asakusa.
- 1991: The Tokyo Metro Namboku Line opens.
- 1995: On March 20, the Tokyo subway sarin attack occurred on the Marunouchi, Hibiya, and Chiyoda Lines during the morning rush hour. Over 5,000 people were injured and 13 people were killed. All three lines ceased operation for the whole day.
- 2004: Teito Rapid Transit Authority was privatized and renamed Tokyo Metro Co., Ltd.
- 2008: The Fukutoshin Line opened.
Both the Tokyo Metro and Toei Subway systems are closely integrated with a unified system of line colors, line codes, and station numbers. However, the separate administration of metro systems has some ramifications:
- For single rides across Metro and Toei systems, a special transfer ticket is required. It costs 70 yen less than the sum of the Metro fare and the Toei fare, calculated based on the shortest possible route between the origin and destination stations.  The Passnet system simplified such ticketing problems, by allowing one stored-fare card to be used on most of the rail operators in the Greater Tokyo Area (with the noticeable exception of JR East which continued to use its own Suica system). The new Pasmo system was introduced in 2007 and completely replaced the Passnet in 2008, finally allowing for one unified stored fare system for most of the Tokyo transit system, including JR East. The fare charged by the stored fare system may be slightly less than for users of paper tickets, as fares are calculated in ¥1 increments on stored fare cards whereas paper tickets are calculated at ¥10 increments.
- The systems represent the metro network differently in station, train, and customer information diagrams. For example, the Toei map represents the Toei Ōedo Line as a circle in the centre, whereas the Tokyo Metro's map saves the central ring line for the Marunouchi Line and the JR Yamanote Line. As well, each system's lines are generally rendered with thicker lines on their respective system maps.
As is common with Japanese subway systems, many above-ground and underground lines in the Greater Tokyo Area operate through services with the Tokyo Metro and Toei lines. In a broader sense they are considered a part of the Tokyo subway network, allowing it to reach farther out into the suburbs.
|A||Asakusa Line||Keikyu Kurihama Line and Keikyu Airport Line both via the Keikyu Main Line ( Sengakuji to Haneda Airport ( Tokyo International Airport) or Misakiguchi)|
|Keisei Oshiage Line, Keisei Main Line, Hokuso Railway Line, Keisei Higashi-Narita Line and Shibayama Railway Line ( Oshiage to Narita Airport, Inba-Nihon-Idai or Shibayama-Chiyoda)|
|I||Mita Line||Tokyu Meguro Line ( Meguro to Hiyoshi)|
|S||Shinjuku Line||Keio New Line and Keio Sagamihara Line both via the Keiō Line ( Shinjuku to Hashimoto or Takaosanguchi)|
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