Artūrs Otomārs Motmillers (1 October 1900 – 18 August 1980) was a Latvian long-distance runner. He competed at the 1924, 1928 and the 1936 Summer Olympics. Motmillers was the winner of the 12th Košice Peace Marathon in 1935, the 1937 Quer durch Berlin race and a eight-time Latvian champion in various lengths. He also broke the national record 13 times, with his marathon time set in 1933 (2.41:38,2) remaining unbeaten for 19 years.