Walter Ritchie Rollo (November 25, 1875 – March 13, 1957) was a Canadian trade unionist and politician in the early 20th century, and was a cabinet Minister in the United Farmers of Ontario - Labour coalition government from 1919 to 1923.

[4] When the 9lst Regiment Canadian Highlanders was formed in Hamilton in 1903, Rollo enlisted and rose over time to become its colour sergeant.

In 1916, he was appointed as a member of Ontario's Organization of Resources Committee which was established to improve Canada's war effort in the Province.

[12][10] He stood for election in Hamilton West in the following campaigns: He and Morrison Mann MacBride were instrumental in negotiating a coalition government between the Independent Labour Party and the United Farmers of Ontario under E.C.

As a result of those negotiations, the ILP had the right to nominate two of its members to the new government: Rollo became the Province's first Minister of Labour—a position that had been created immediately before the election by the previous Conservative government of William Hearst[16]—and Harry Mills became the first Minister of Mines.