Harold Proctor Shewman (born April 14, 1900 in Winnipeg, Manitoba, died July 13, 1968) was a politician in Manitoba, Canada. He served as a member of the Legislative Assembly of Manitoba from 1949 until his death in 1968.

Shewman was educated at Wellington School in Winnipeg, and worked as an auctioneer-agent. He was a school trustee from 1925 to 1938, and served as mayor of the Town of Morris from 1948 to 1954, coinciding with his early period in the legislature.

He was first elected to the Manitoba legislature in the provincial election of 1949 . At that time, Manitoba was governed by a coalition of the Liberal-Progressives (commonly called Liberals) and Progressive Conservatives. Shewman ran as an independent candidate in Morris, and defeated coalitionist John C. Dryden by 153 votes. He was initially identified as a supporter of the coalition, but had turned to the opposition side by 1950.

In 1950, Shewman repeatedly called on Premier Douglas Campbell to declare a state of emergency over rising flood waters. Campbell delayed, which resulted in federal funds not being available for several local municipalities.

Shewman was re-elected in the 1953 general election as an independent. He was not opposed by the Progressive Conservatives (who had left the coalition by this stage), and seems to have been in at least a tacit alliance with that party. He formally joined the Progressive Conservatives in 1954, after Dufferin Roblin became the party's leader.

The Progressive Conservatives made significant gains in the 1958 provincial election , and formed a minority government after the vote. Shewman was easily re-elected under the PC banner, and was returned without difficulty in the elections of 1959 and 1962. In the 1966 election, he defeated Liberal Bruce McKenzie by 230 votes. He was never appointed to a cabinet position.

Shewman died in 1968. The Morris seat has remained Progressive Conservative since this time.

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