William Menzies McAllister (November 2, 1905 – October 13, 1986) was an American politician and jurist in the state of Oregon.

[3] McAllister then started a law firm in Medford, in Jackson County, Oregon, where he remained for 25 years.

[3] In 1948, he won election to the Oregon State Senate, and served in that chamber during the 1949 session.

[7] Also in 1948, and again in 1952, William M. McAllister was a delegate from Oregon to the Republican National Convention, with his wife serving as an alternate in 1948.

[3] On August 24, 1956, William M. McAllister was appointed to the Oregon Supreme Court as a justice.

[3] William McAllister died in Salem, Oregon, on October 13, 1986, at the age of 90 years.