This is the third Report Card for Physical Activity in New Zealand, with the previous cards published in 2014 and 2016, as part of the Global Matrix of Report Cards initiative. This international collaboration uses a harmonised process for evaluating how countries are performing in relation to children’s activity behaviours and related environmental contexts. Report Cards are useful for raising awareness and advocating for health promoting policies and environments for healthy, active children and youth. The 2018 Report Cards assign grades across ten indicators (overall physical activity, organised sport and physical activity, active play, active transportation, sedentary behaviours, physical fitness, family and peers, school, community and environment, government).