富农（俄语：кула́к，罗马化：kulak，IPA：[kʊˈlak]），是指在俄罗斯帝国后期至苏联初期，一些相对富裕的农民阶级的称呼。

他们有自己的土地自己耕作，农忙时也会雇人耕作，也有自己的耕牛。

虽然他们不是地主，但是根据马列主义理论，他们被视为小资产阶级，是无产阶级的阶级敌人。

斯大林在1929年发动农业集体化后，他们被宣布为农村剥削者，财产被充公集体农庄，本人被发配西伯利亚的劳改营。

在1930年，斯大林称富农阶级在政治上已不存在。

Kulaks (Russian:кула́к, tr.kulak;IPA: [kʊˈlak], Polish:kułak) "fist", by extension "tight-fisted"; kurkuls in Ukraine, also used in Russian texts (in Ukrainian contexts) were a category of affluent landlords in the later Russian Empire, Soviet Russia, and the early Soviet Union. The word kulak originally referred to independent farmers in the Russian Empire who emerged from the peasantry and became wealthy following the Stolypin reform, which began in 1906. The label of kulak was broadened in 1918 to include any peasant who resisted handing over their grain to detachments from Moscow. During 1929–1933, Stalin's leadership of the total campaign to collectivize the peasantry meant that "peasants with a couple of cows or five or six acres more than their neighbors" were being labeled "kulaks".