犁是一种耕地的农具，用途是破碎土块并耕出槽沟，从而为播种做好准备。犁也可以将较深层的土翻到表面上。犁是在一根横梁端部的厚重的刃构成，通常系在一组牵引它的牲畜或机动车上，也有用人力来驱动的。犁的材质可以是木头或是铁，自有信史以来，犁就是人类使用的工具之一，而且也是农业上的一大进步。

犁的功用是将较较深层的土壤翻到土地的表面，并且可以盖住杂草及以前的作物并让其自行分解。当犁划过土壤时，产生了有肥沃土壤的长沟。现在犁过的土地会先让其干燥，用耖破碎土块并平整后再种植植物。犁地及土壤的处理约会影响土壤上层的12至25公分。在许多土壤中，植物的细根会出现在犁过的上层土壤。

A plough (UK) or plow (US; both /ˈplaʊ/) is a tool or Farm implement used in farming for initial cultivation of soil in preparation for sowing seed or planting to loosen or turn the soil. Ploughs are traditionally drawn by working animals such as horses or cattle, but in modern times may be drawn by tractors. A plough may be made of wood, iron, or steel frame with an attached blade or stick used to cut the earth. It has been a basic instrument for most of recorded history, although written references to the plough do not appear in English until 1100 CE at which point it is referenced frequently. The plough represents one of the major advances in agriculture.