The Irish National Land League, also known as the Land League, was an Irish political organisation of the late 19th century which organised tenant farmers in their resistance to exactions of landowners. Its primary aim was to abolish landlordism in Ireland and enable tenant farmers to own the land they worked on. The period of the Land League's agitation is known as the Land War. Historian R. F. Foster argues that in the countryside the Land League "reinforced the politicization of rural Catholic nationalist Ireland, partly by defining that identity against urbanization, landlordism, Englishness and—implicitly—Protestantism." Foster adds that about a third of the activists were Catholic priests, and Archbishop Thomas Croke was one of its most influential champions.

A tenant farmer is a person who resides on land owned by a landlord. Tenant farming is an agricultural production system in which landowners contribute their land and often a measure of operating capital and management, while tenant farmers contribute their labor along with at times varying amounts of capital and management. Depending on the contract, tenants can make payments to the owner either of a fixed portion of the product, in cash or in a combination. The rights the tenant has over the land, the form, and measures of payment vary across systems. In some systems, the tenant could be evicted at whim ; in others, the landowner and tenant sign a contract for a fixed number of years. In most developed countries today, at least some restrictions are placed on the rights of landlords to evict tenants under normal circumstances.