Martha Alma Wall (March 22, 1910 – August 2, 2000) was an American Christian medical missionary, philosopher, nurse, and author who is best known for her humanitarian work providing health care to lepers in British Nigeria during the 1930s and 1940s with the Sudan Interior Mission (SIM). She was born in Hillsboro, Kansas to a traditional Christian family and was a devout member of both the non-denominational Salina Bible Church and the Baptist Women's Union. She became a registered nurse and studied theology at Tabor College before leaving for a medical mission in British Nigeria in 1938. After returning to America, Wall worked as a Clinical Supervisor of Vocational Nurses for Kern General Hospital during the 1950s and as an instructor and director of nursing services for Bakersfield Colle