Aphids are one of the main pests of alfalfa in Spain. The relationship between aphids and ladybeetles has been determined. Alfalfa was sampled by sweep-netting along its productive period in several commercial stands each year between 2010-2020. Acyrthosiphum pisum and Therioaphis trifolii were the most abundant aphid species, peaking in the 2^nd and 4^th intercut, respectively. Coccinella septempunctata and Hippodamia variegata were by far the coccinelid prevalent species. There were positive correlations between the abundance of C. septempunctata and A. pisum at the 2^nd intercut; H. variegata and T. trifolii at the 4^th intercut; and H. variegata and the total number of aphids in the 5^th intercut.