Wilbur McClure Alter (December 17, 1879 – July 30, 1967) was an American judge who served on the Colorado Supreme Court from 1928–1933 and again from 1944–1957.
He served as Chief Justice of the Court from 1955–1957.He was born in Allegheny County, Pennsylvania in 1879.
He graduated from the University of Denver in 1904 and received his law degree in 1906.