Kettleby is an unincorporated community in the northeastern part of King Township in Ontario, Canada.

Kettleby was established no later than 1825, when Jacob Tool of Pennsylvania purchased 100 acres (0.40 km2) in a wide ravine, including a stream.

It was the industrious Septimus Tyrwhitt, who purchased 46 acres (190,000 m2) of Tool's property in 1842, that spurred development of more mills and the eventual settlement of Kettleby.

[2] On August 6, 1851, the first post office was opened, and was styled Kettleby Mills, Canada West.

The hamlet's first distillery preceded the movement by nearly a decade, having been erected in 1843, and numerous establishments throughout King were licensed to serve alcohol, including two hotels in Kettleby.

The actual hamlet of Kettleby has 40 dwellings, a church, cemetery, bakery, day camp and conservation area with a 2012 population of 101 made up of 84 adults and 17 children.

[5] Facilities at the site include greenhouses with a system-controlled environment, a plant pathology laboratory, and long-term cold storage.