What is trust (in science and scientists) and is it in crisis?

Public trust in science and scientists contributes to important social beliefs and behaviours. Yet it is sometimes believed to be in crisis. This article reviews what trust consists of and how it is typically measured. Drawing on national and international survey data, it shows there is little evidence of a public crisis of trust. While there is evidence of a polarisation of trust in certain countries, this picture does not apply more widely. Nonetheless, initiatives to maintain public trust are important; but these should focus on scientists' wider social position and roles rather than simply emphasising their competence. If there is a problem, it lies in the limited influence of scientific messages rather than in public distrust of scientists.