Based on the evidence gap map of behavioural science interventions within the development and environmental fields in developing countries, this protocol for a systematic review focuses on synthesizing the evidence on the effectiveness of behavioural science interventions, including feedback, reminders, salience (communication), salience (experience design), and goal setting in promoting environmental and development goals in developing countries. This protocol presents the overall approach for the systematic review of the effectiveness of these specific behavioural science interventions on environmental and development outcomes in developing countries, with a particular focus on the data collection and analysis.