Objectives. The purpose of this consensus statement is to determine the state of the field of loneliness among older people, highlighting key issues for researchers, policymakers and those designing services and interventions. Methods. In December 2018, an international meeting on loneliness was held in Belfast with leaders from across the USA and Europe. An analysis of the content, conclusions and discussion of each presentation was conducted to determine the frequency and consistency of statements. Results. This meeting resulted in agreement to produce a consensus statement on key issues including definitions of loneliness, measurement, causes/antecedents, consequences and interventions. Discussion. There has been an exponential growth in research on loneliness among older adults. However differing measurements and definitions of loneliness means the incidence and prevalence, associated risk factors and health consequences are often conflicting or confusing especially for those developing policy and services. This consensus statement aims to help address these challenges.