This catalog contains information on the family Apidae (Hymenoptera: Anthophila), the richest and most abundant group of bees worldwide. Apidae includes the most common and familiar bees, such as honey bees (Apis mellifera), bumble bees (Bombus), stingless bees (Meliponini) and carpenter bees (Xylocopinae), as well as a huge and diverse number of lesser-known bee species. It is also the family with the most diverse behavior, although most of its species are solitary in habit, also includes lineages of eusocial bees (Apini and Meliponini) and parasites (mainly included in the subfamily Nomadinae). In Argentina, Apidae is the most diverse, both in number of genera and species. In this catalog we provide basic taxonomic information such as synonyms, geographical distribution in Argentina and Uruguay and the most relevant bibliographical references. In addition, for many of the species we include photographs and information on their host plants, observations on their nests and natural enemies. All the information available in this catalog was compiled by the authors using available scientific literature, information from material deposited in the entomological collection of the Museo de La Plata and their own field work.