Technical Abstract: Biofortification of foods, achieved by increasing the concentrations of minerals such as Fe and Zn, is a goal of plant scientists. Understanding genes that influence seed mineral concentration in a model plant such as Arabidopsis could help in the development of nutritionally enhanced crop cultivars. Quantitative trait locus (QTL) mapping for seed concentrations of Ca, Cu, Fe, K, Mg, Mn, P, S, and Zn was performed using two RIL populations, Col x Ler and Cvi x Ler, grown on multiple occasions. QTL mapping was also performed using data from silique hulls and the ratio of seed:hull mineral concentration of the Cvi x Ler population. Over 100 QTL that affected seed mineral concentration were identified. Twenty-nine seed QTL were found in more than one experiment, and several QTL were found for both seed and hull mineral traits. A number of candidate genes affecting seed mineral concentration are discussed. Our results indicate that A. thaliana is a suitable and convenient model for discovery of genes that affect seed mineral concentration. Some strong QTL had no obvious candidate genes, offering the possibility of identifying unknown genes that affect mineral uptake and translocation to seeds.