Farmall was a model name and later a brand name for tractors manufactured by the American company International Harvester (IH). The Farmall name was usually presented as McCormick-Deering Farmall and later McCormick Farmall in the evolving brand architecture of IH.
Farmalls were general-purpose tractors. Their origins were as row-crop tractors, a category that they helped establish and in which they long held a large market share. During the decades of Farmall production (1920s to 1970s), most Farmalls were built for row-crop work, but many orchard, fairway, and other variants were also built. Most Farmalls were all-purpose tractors that were affordable for small to medium-sized family farms and could do enough of the tasks needed on the farm that the need for hired hands was reduced and the need for horses or mules was eliminated. Thus Farmall was a prominent brand in the 20th-century trend toward the mechanization of agriculture in the US.
The original Farmall is widely viewed as the first tractor to combine a set of traits that would define the row-crop tractor category, although competition in the category came quickly. Although it was not the first tractor to have any one of these traits, it was early in bringing the winning combination to market. The traits included (a) 'tricycle' (a single front wheel or narrowly spaced pair), high ground clearance, quickly adjustable axle track, excellent visibility all around and under the machine, and light weight; (b) sufficient power for plowing and harrowing, and a belt pulley for belt work; and (c) all at low cost, with a familiar brand and an extensive distribution and service network. The first group of traits allowed for more nimble maneuvering and accurate cultivation than most other tractors of the day; additionally, because of the second group, the Farmall could also, like previous tractors, perform all the other duties a farmer would have previously achieved using a team of horses. A tractor could yield lower overall operating costs than horses as long as it was priced right and reliable (and its fuel supply as well). The Farmall, mass-produced with the same low-cost-and-high-value ethos as the Ford Model T or Fordson tractor, could meet that requirement. The Farmall was thus similar to a Fordson in its capabilities and affordability, but with better cultivating ability.