The 11th edition of the International Symposium on Knappable Materials “From Toolstone to Stone Tools” is the first edition of the conference held out of Europe. This edition of the symposium has attracted a strong global response, by bringing together 358 researchers from 28 different countries, representing the five continents. Buenos Aires City (Argentina) was selected as the seat for the Symposium, at Universidad del Salvador from November 7th to 10th, 2017. Participants also have the opportunity to participate in an optional trip to visit archaeological sites, prehistoric quarries, and geological reference locations on the Atlantic coast and inland hills of the Buenos Aires Province on November 11th and 12th, 2017. The 11th ISKM was organized by the Instituto Multidisciplinario de Historia y Ciencias Humanas (IMHICIHU-CONICET), but the Organizing Committee included members from the Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL) and the Área de Arqueología y Museos de la Municipalidad de Necochea. The symposium includes 154 papers which address current issues in knappable materials across the globe. This volume compiles the abstracts.