Tadao Tannaka was a Japanese mathematician.
His early works were related mainly to Galois theory and number theory.
Note that this article is in the first series of Tôhoku; the current issues and the euclid archive covers just the second series. Tannaka was an editor of Tôhoku Math. J. for a longer period.
He also wrote a booklet in Japanese which treats a wider picture of dualities
His biography has been published in Tôhoku Math. J. (see project euclid)