Hayashi Utako (林歌子, January 11, 1865 – March 24, 1946; some sources give 1864 as the birth year) was a Japanese educator and social worker.

As head of the Osaka branch of the Woman's Christian Temperance Union, she led campaigns against businesses serving alcohol in 1909, 1912, and 1916.

[1] She trained as a teacher and converted to Christianity in 1887,[2] influenced by the preaching of Tokyo's Anglican bishop, Channing Moore Williams.

[11] "Next to Mrs. Yajima, the greatest woman in the anti-vice movement is Miss Utako Hayashi," explained an American writer in 1923.

She and Tsuneko Gauntlett presented a petition to British prime minister Ramsay MacDonald, on behalf of the Women's Peace Association of Japan.