Inappropriate prescriptions and consumption of antibiotics are the main determinants of the selection of antibiotic resistant bacteria. Italy has a high consumption rate of antibiotics if compared to other European countries and 90% of these drugs are prescribed in an outpatient setting by General Practitioners (GPs). Therefore, as stated by the Italian Medicines Agency (AIFA): «General Practice is [...] a crucial clinical area in which the utilization of these kind of drugs have to be monitored, [...] considering that a relevant quote of prescriptions could be avoided. Achieving a better understanding of the clinical and extra-clinical determinants of GPs prescription habits is, therefore, hugely important to design appropriate interventions to tackle the phenomenon of inappropriate antibiotic use. To the best of our knowledge, there are no published studies measuring GPs knowledge and attitudes on antibiotic resistance and prescriptions in our setting. To fill this lack of knowledge, the aim of our study is the development of a valid and reliable questionnaire in Italian language, able to measure these constructs. In this article, we present the process of cross-cultural adaptation of the KAAR-11 questionnaire from Spanish into Italian language and its preliminary validation.