Sugiuchi Kazuko (杉内 寿子), née Honda Kazuko (本田 寿子, born 1927) is a Nihon Ki-in female professional Go player.
She learned Go from her father, starting at age 6.
Sugiuchi reached 8-dan in 1983. Until 2012-12-06 she held the record for most wins (female players) in Japan (589 wins in her career).
Kato Tomoko and Inoue Naomi are her pupils, while she was a pupil of Kita Fumiko. She was married to Sugiuchi Masao 9-dan until his death in 2017.
She won the Women's Meijin from 1991-1994, the Women's Kakusei in 1983 & 1986, and the All Japan Women's championship from 1953-1956.
After the death of her husband, she returned at the age of 91 to active play, competing for all 7 Japanese titles and 4 female tournaments.
Sugiuchi Kazuko is one of three sisters, all of whom are professional go players. The other two are Honda Sachiko and Kusunoki Teruko.