Thomas Hazeltine McDill (July 18, 1815 – January 14, 1889) was an American businessman, Republican politician, and pioneer of Portage County, Wisconsin.

[1] He received a common school education there and moved to the Wisconsin Territory in 1840, working as a lumberman at Mill Creek.

By 1844, a larger number of lumbermen had moved to the area, and he decided to sell the mill to open a hotel to take advantage of the influx of new residents.

[2] His hotel business brought him into local politics, and in 1847 he was appointed sheriff of Portage County by Governor Henry Dodge.

Their son, George Edward McDill, also became a prominent businessman and politician in Portage County and was chairman of the Republican Party of Wisconsin.