Impact and evaluation can be interlinked, but they have subtly different implications. Evaluation is frequently focused on the outcomes of an activity, which can often be obvious and immediate, whereas impact would imply there has been some longer-term influence or change. In research communication we have an interest in both how evaluation can be designed to factor in outcomes and impacts, but also how the evaluation of research communication activities can itself support evidence of the impact of research. This chapter explores such themes providing advice to researchers on how to evaluate and consider impact in the context of their research communication activities.