Strikes have important effects on the workers and employers directly involved as well as significant indirect effects on consumers, economic growth, electoral outcomes, policy making, and political stability. Moreover, strikes form patterns that illuminate long-term social processes, the dynamics of economic and political conflict, and the functioning of industrial relations systems. Because strikes are important as both causes and symptoms of social change, an extensive literature has arisen on patterns of strike activity. To date, however, this literature has focused mainly on advanced industrial countries. To prepare the way for analyses of strike patterns in Latin America, more research is needed on the ways in which Latin American strike statistics have been collected and reported. This research note will report the results of such research for Argentina. The first section will assess the quality of strike statistics covering a century of Argentine history. The second section will compare four sources of data on Argentine strikes since the return to democracy in 1983, focusing on particularly useful data published by the Consejo Técnico de Inversiones (CTI) in Buenos Aires. The third section will make the CTI statistics available for research and will employ them to assess some widely held assumptions about labor militancy in Argentina during the period from 1984 to 1993.