The objective of this article is to study the evolution of Spanish agricultural exports, their share of agricultural production as a whole, the determinants of their expansion and, finally, the contribution that they have made to economic development. Our results show considerable dynamism in agricultural exports, which however faced certain obstacles that limited any further expansion. Their share on production varied greatly, but for some relevant products it was fundamental, substantially contributing to its growth. The increase in external demand but also the comparatively high profitability of export products and a high level of competitiveness in the international market generated highly dynamic behaviour in supply. The contribution of the export sector to Spanish economic growth was positive although moderate. It contributed to financing necessary imports during the industrialisation process, favoured a more efficient allocation of resources and produced intersectoral linkages. However, the geographical concentration of production for export limited its spatial impact on the Spanish economy.