Malaysian Good Agricultural Practices Scheme (MyGAP) is a certification designed to give recognition for farms that practice good agricultural practices with an environmentally friendly concept, safeguard the welfare and safety of workers to produce quality, safe and edible products. Even though MyGAP certificate give a huge benefit in improving the quality of fresh produce and expand the market, surprisingly the adoption level of MyGAP among pineapple smallholders are relatively low. Therefore, this study was conducted to examine the relationship between factors that influence the adoption of MyGAP among pineapple smallholders in Muar, Johor. Data collection through questionnaires were obtained from 130 pineapple smallholders using online methods. This study used simple random sampling approach to obtain useful data and information from respondents. Theory of Planned Behaviour (TPB) was employed to study the factors influencing the adoption of MyGAP among pineapple smallholders. Descriptive, Pearson correlation and multiple regression analysis were used to analyse the gathered data. The result indicates that knowledge, attitude, perceived behavioural control and subjective norms have a relatively significant relationship with the adoption of MyGAP at farm. Furthermore, perceived behavioural control was identified as a dominant factor that influence smallholders' adoption of MyGAP. The adoption of MyGAP at farm will significantly contribute to sustainable agriculture economy development and subsequently increase the income of smallholders.