Howard Lee McBain (July 20, 1880 – May 7, 1936) was an American political scientist. He is best known for originating the phrase "Living Constitution", the subject of his 1927 book of the same name.
Howard Lee McBain was born in Toronto, Canada, on July 20, 1880, but lived in Richmond, Virginia, from 1882 until 1904. He entered Richmond College in 1896, and earned a Bachelor of Arts (AB) degree there in 1900 and a Master of Arts (MA) in 1901. While there he was elected a member of Phi Beta Kappa. He was assistant principal of Richmond High School from 1901 to 1904, when he entered the University of Chicago. He was the President's Scholar in Constitutional Law at Columbia University from 1904 to 1906, and an Honorary Fellow in Constitutional Law from 1906 to 1907. He earned his Master of Arts (MA) degree there in 1905, writing his master's thesis on "Constitutional development in Virginia, 1776–1850", and a Doctor of Philosophy in 1907, writing his thesis on "De Witt Clinton and the origin of the spoils system in New York".
After spending a year as dean of the College of Political Sciences at George Washington University, and three as an associate professor at the University of Wisconsin, MacBain came back to Columbia in 1913 as an associate professor of municipal science and administration. He became Eaton Professor in 1917 in succession to Frank Johnson Goodnow, and in 1929 became the Ruggles Professor of Constitutional Law. He was also the chairman of Columbia's Department of Political Science and Public Law. Columbia granted him an honorary Doctor of Laws (LLD) degree in 1927, as did Richmond College in 1932.