The purpose of the Italian Information Retrieval Workshop (IIR) is to provide a meeting forum for stimulating and disseminating research in Information Retrieval, where Italian researchers (especially young ones) and researchers affiliated with Italian institutions can network and discuss their research results in an informal way. IIR 2021 is the 11th edition of the Italian Information Retrieval Workshop. It will take place on September 13-15, 2021 at the Department of Electrical and Information Engineering of the Polytechnic University of Bari, Italy. This edition of the Italian Information Retrieval Workshop will include a number of invited lectures and tutorials from senior researchers. Participation to the IIR 2021 workshop will be free of charge. However, advance registration will be strictly required.