Robert Leon Basmann (born January 15, 1926) is an American econometrician. He was a Professor of Econometrics at Texas A&M University until his retirement. He served as a lecturer at Binghamton University after his retirement. Basmann held academic appointments at Northwestern University, University of Chicago and Purdue University prior to joining the faculty at Texas A&M. Basmann earned a Ph.D. in economics from Iowa State University in 1955. He is credited, along with Henri Theil, for deriving two stage least squares estimation.