Judith Ellen Horton Foster (November 3, 1840 – August 11, 1910) was an American lecturer, temperance worker, suffragist, and lawyer.

[2] Judith Delano descended from the De Lannoy family; the Fortune ship which replaced another ship, the Speedwell, arrived from England and sailed to Plymouth Colony in early July 1621, arriving on November 9, 1621, with Philippe De Lannoy among its passengers.

[4][5] His eldest son, Jotham W. Horton, was killed by a mob on August 5, 1866, after the New Orleans Race Riot of July 30, 1866.

[6] Judith Horton was educated in public school and then at the Genesee Wesleyan Seminary, Lima, New York.

Her knowledge of law enabled her to help the movement for the adoption of constitutional amendments in the various states aimed at securing the prohibition of the sale and manufacture of alcoholic liquors.

Her views naturally led her to affiliate with the Non-Partisan National Woman's Christian Temperance Union, and she served that body for several years as corresponding secretary, having her office in Boston.

Attorney General George W. Wickersham appointed her a member of a committee to investigate conditions in Federal prisons.

As a representative of the American Red Cross, Foster and Clara Barton were sent to St. Petersburg by Secretary of State John Hay in 1902.

In 1907, she was appointed a special agent of the Department of Justice, and in 1908 she advocated the addition of a women's wing to the Federal prison at Fort Leavenworth.

They had one daughter, Mary Elizabeth, who died at the age of 5, and one son, William Horton Avery (1863–1946), who later changed the name to Foster.