Thomas Marshall Ostrom (March 1, 1936 – May 16, 1994) was a psychologist who helped further the study of social psychology.
Prior to Ostrom, the field explored and identified the cognitive foundations of social activity.
He joined the faculty of the Ohio State University that same year, and remained there the rest of his life.
His work helped further the "ABC" tripartite model of attitudes (affect, behavior, cognition).
[citation needed] He was the organizer of "social cognition week" at the Nags Head Conference Center and founder of the Person Memory Interest Group, developing both events into among of the key conferences in the field of social psychology.