The Toei 7700 series (東京都交通局7700形) is a tramcar type operated by Tokyo Metropolitan Bureau of Transportation (Toei) on the Toden Arakawa Line in Tokyo, Japan, since May 2016.

[1] The cost of building the 7700 series from the earlier 7000 series cars is approximately 130 million yen per car, compared to the cost of approximately 180 million yen for purchasing new 8900 series cars.

[4] The individual tramcars are finished in retro-style liveries as follows.

Toei announced details of the new 7700 series fleet in March 2016.

[3] The first car, 7701 in green livery, entered service on 30 May 2016.