This article evaluates the extent of child farm labour in Spain in the late-nineteenth and early-twentieth centuries. The first part of the article examines child labour in rural areas. Because under-registration of farm child labour was common in both national and local censuses, the writer examines other evidence, including surveys of child labour on farms and school-enrolment registers listing seasonal and as well as full-time labour. The second part of the article considers the relationship between employment and school absenteeism by age and gender. School attendance is compared by season and by geographic area, and its relation to farming is apparent. All the evidence in the registers demonstrates extensive employment of children over the age of ten in rural Spain.