Kathryn Dyakanoff Seller (Russian: Екатерина Дьяканова Селлер; born Ekaterina Pelagiia Dyakanoff; December 7, 1884 – June 17, 1980) was a Russian Creole educator. With her husband, she built and opened the first government-funded schoolhouse in the Aleutian Islands, in 1909.