Walter Duncan McIndoe (March 30, 1819 – August 22, 1872) was a Scottish American immigrant, lumber industrialist, and politician.

In 1850 as a member of the Assembly he introduced a bill changing the name of his home community from "Big Bull Falls" to Wausau and creating Marathon County.

[1] He was a candidate for the Republican nomination for Governor of Wisconsin at the 1857 Republican state convention, contending with Edward Dwight Holton, with both candidates losing to the eventual nominee and governor, Alexander Randall.

In 1866, McIndoe declined candidacy for renomination, instead resuming his interests in the lumber business.

He died in Wausau, Wisconsin, on August 22, 1872, and was interred at Pine Grove Cemetery.