A farmworker or agricultural worker is someone employed for labor in agriculture. In labor law, the term "farmworker" is sometimes used more narrowly, applying only to a hired worker involved in agricultural production, including harvesting, but not to a worker in other on-farm jobs, such as picking fruit.

Farm workers on a field near Mount Williamson. This photograph is by Ansel Adams.

Agricultural work varies widely depending on context, degree of mechanization and crop. In countries like the United States where there is a declining population of American citizens working on farms—temporary or iterant skilled labor from outside the country is recruited for labor intensive crops like vegetables and fruits.

Agricultural labor is often the first community effected by the human health impacts of environmental issues related to agriculture, such as health effects of pesticides or exposure to other health challenges such as valley fever. To address these environmental concerns, immigration challenges and marginal working conditions, many labor rights, economic justice and environmental justice movements have been organized or supported by farmworkers.