Martha Ingham Dickie Sharp Cogan (April 25, 1905 – December 6, 1999) was an American Unitarian who was involved in humanitarian and social justice work with her first husband, a Unitarian minister, Waitstill Sharp, and others of her denomination, and so helped hundreds of Jews to escape Nazi persecution, through relocation and other efforts. On September 2005, Martha and Waitstill Sharp were named by the Yad Vashem organization as "Righteous Among the Nations", the second and third of five Americans to receive this honor. The subsequent ceremony involved the presentation of a medal and certificate of honor to the Sharps' daughter, Martha Sharp Joukowsky, amidst a large audience that included one of the children that her parents had helped get out of France, .