The Tokyo Metro Chiyoda Line (東京地下鉄千代田線) is a metro line in Tokyo, Japan, administered by the Tokyo Metro. Its color on maps is dark green. Stations on the Chiyoda Line carry the letter C followed by a number.
The first stretch of line was opened on December 20th, 1969 between Kita-Senjū and Ōtemachi. The line was almost completed by October 10, 1972 when it reached Yoyogi-Kōen, although the 1 km section between there and Yoyogi-Uehara was not completed until March 31st, 1978.