Tadatomo Yoshida (吉田 忠智, Yoshida Tadatomo, born 7 March 1956 in Usuki, Ōita Prefecture)[1] is a Japanese politician and former member of the House of Councillors from the proportional representation constituency.

He previously served as an Ōita prefectural assembly member.

He ran for the Chairmanship of the Social Democratic Party (SDP) and defeated Tokyo City Toshima Ward Councilor Taiga Ishikawa, the first openly gay SDP elected politician, by a vote of 9,986 to 2,239 to win the party election on 14 October 2013.

[2] After a disappointing result in the 2016 upper house election, he announced his resignation as head of the party.

[6] On 24 December 2020, Yoshida submitted a notice of withdrawal to the Social Democratic Party and a notice of admission to the Constitutional Democratic Party (CDP), both of which were accepted on the same day.