Tracy Dickinson Mygatt (March 12, 1885 – November 22, 1973) was an American writer and pacifist, co-founder with Frances M. Witherspoon of the War Resisters League, and longtime officer of the Campaign for World Government.

[8] Mygatt joined Jessie Wallace Hughan and John Haynes Holmes in launching the Anti-Enlistment League in 1915.

[14][15] In 1969, after moving into a retirement home in Philadelphia, she continued to serve as part-time East Coast Secretary of the Campaign for World Government till her death in 1973.

[16] Witherspoon and Mygatt co-wrote two Biblical novels, The Glorious Company (1928) and Armor of Light (1930), and a play about Vincent van Gogh, Stranger Upon Earth, among other literary collaborations.

[17][18] Mygatt also wrote several plays on her own (Children of Israel,[19] Watchfires,[20] Grandmother Rocker,[21] Good Friday,[22] The Noose,[23][24] Sword of the Samurai,[25] His Son, Thim Socialists, and Bird's Nest), and published Julia Newberry's Sketch Book: or, The Life of Two Future Old Maids (1934), a biography of her mother and her mother's cousin.