This study examines the factors that influence pro-environmental behaviour intention (PEBI) in manufacturing small- and medium-sized enterprises (SMEs). The data were collected from 517 executives and chief technology officers of Korean SMEs and analysed using a comprehensive research model. The model includes variables such as awareness of consequences (ACs), ascription of responsibility (AR), personal norms (PNs), extrinsic motivation (EM), subjective norms (SNs) and realistic values (RVs). The results show significant relationships between these factors and PEBI. In particular, ACs and AR have positive effects on PNs, with AR having a stronger effect. PNs are the most important predictor of PEBI. EM has a positive impact on behaviour intention, while SNs do not have a significant impact. Interestingly, RVs have a negative impact. These findings have practical implications for encouraging pro-environmental behaviour in manufacturing SMEs. Policymakers and business planners should focus on increasing awareness of environmental consequences and individual responsibility to reinforce PNs. Moreover, offering extrinsic rewards and benefits can motivate pro-environmental behaviour in these firms. Understanding these factors can help design targeted strategies for promoting sustainability practices within manufacturing SMEs. By addressing these aspects, businesses can contribute to environmental innovation and sustainable development.