Walter Morley Aseltine, PC QC (September 3, 1886 in Napanee, Ontario – November 14, 1971) was a Canadian parliamentarian.
A farmer and lawyer by training, Aseltine ran unsuccessfully for a seat in the House of Commons of Canada as the Conservative candidate for Rosetown, Saskatchewan in the 1926 election.
He became Government Leader in the Senate in 1958 under John Diefenbaker.
Aseltine resigned from the Senate in March 1971 at the age of 84 for health reasons.
The elementary school in Rosetown, Saskatchewan is named "Walter Aseltine School."