Thomas Barr Greenfield (1930–1992) was a Canadian scholar, whose ideas have been influential in the study of educational administration.

After graduating from the undergraduate program in British Columbia he began teaching in schools and eventually moved to the field of educational administration.

After a brief stay in British Columbia, he received an appointment at the Ontario Institute for Studies in Education at the University of Toronto where he wrote his most influential works.

In his work, Greenfield showed that there are deep ethical and political implications to any conception of educational organizations, particularly in relation to freedom, agency and responsibility.

[7] He criticized positivist accounts of educational administration, according to which individuals are essentially different and separate from organizations.