Raiden Tameemon (雷電爲右衞門), born Seki Tarōkichi (January 1767 – 11 February, 1825), was a Japanese sumo wrestler from Tōmi, Nagano Prefecture.

[1] When Urakaze Kazuki invited him to Edo and started training him, it turned out that Raiden possessed not only the body of a giant (by 18th-century Japanese standards), but also a talent for sumo wrestling.

Between November 1793 and April 1800, Raiden finished with the best record in all tournaments he participated in, ahead of the other great fighters of his time, Tanikaze and Onogawa.

Raiden's championships are, however, regarded as unofficial by the Japan Sumo Association, as before the current yūshō system was established in 1909, there was no prize given for individual performances in tournaments.

He became chairman of the sumo association of Izumo Province (in today's Shimane Prefecture), where his sponsor daimyō resided.

Since his death, Raiden has appeared not only as subject of a number of statues, but also on postage stamps, beer labels, anime and manga.

Journalist Masahiko Nomi theorized that the 19th Yoshida Oikaze granted yokozuna licences to only two wrestlers, Tanikaze and Onogawa, and not intended to honor any more in the future.

Raiden's sponsor, Daimyo Matsudaira Harusato, was a descendant of Yūki Hideyasu, a son of Tokugawa Ieyasu.

When Jinmaku Kyūgorō erected the yokozuna memorial monument at Tomioka Hachiman Shrine in 1900, he included Raiden's name as a "peerless rikishi",[6] in spite of his never having been officially promoted.