Stanley William McInnis (October 8, 1865 – November 4, 1907) was a Canadian dentist and politician in Manitoba.

He served in the Legislative Assembly of Manitoba from 1899 to 1907 as a member of the Conservative Party, and was briefly a cabinet minister in the government of Rodmond Roblin.

In 1902, he moved a motion at a meeting of the Canadian Dental Association to adopt a code of ethics.

He served as a backbench supporter of the governments of Hugh John Macdonald and Rodmond Roblin in the legislative sitting that following.

McInnis was re-elected with increased majorities in the 1903 and 1907 elections, and was named to cabinet on June 26, 1907 as Provincial Secretary and Municipal Commissioner.