Risto Sakari Alapuro (28 April 1944 – 6 December 2022) was a Finnish sociologist.
Alapuro was an internationally known social scientist who focused on historical sociology in Finland.
He researched, studied and taught in France, Russia and the United States.
Alapuro wrote his doctoral dissertation Akateeminen Karjala-Seura (in 1973).
His other works include State and revolution in Finland (1988), which concerns the Finnish civil war, and Suomen synty paikallisena ilmiönä 1890-1933 (1994), which is about the birth of Finnish nationhood as a local phenomenon.