Mariano Juaristi Mendizábal (February 21, 1904 – January 12, 2001) was an Azkoitian Basque pelota player known as Atano III.
He is often considered one of the best pelotaris of all time, dominating the 1st hand-pelota category from 1926 to 1948 and winner of 4 championships (1940, 1942, 1944 and 1946).