Aleksandras Mykolas Račkus (7 June 1893 – 9 October 1965) was a Lithuanian physician and an active member of the Lithuanian American community known for his numismatic and other collection. In 1917, he co-founded the Lithuanian Society of Numismatics and History in Chicago. In 1935, his and the society's collections were acquired by Lithuania and are held by the M. K. Čiurlionis National Art Museum. He then restarted a Lithuania-themed collection which was acquired by the Balzekas Museum of Lithuanian Culture in 1965. A collection of various documents related to Lithuanian Americans and their organizations and societies is kept by the Martynas Mažvydas National Library of Lithuania.