The purpose of this study was to examine the effects of reflective practice (RP) on improving badminton players' performance. Sixteen developmental badminton players were subjected to a six weeks group-based RP intervention. A mixed methods research design was employed to collect in depth information to answer the research question. Pre- and post-intervention data were collected on the badminton skills of lob and underarm serve. Individual interview was conducted to examine participants' perception on the usefulness of group-based RP in enhancing their own learning and performance. Quantitative data were analysed using paired samples t-test, while thematic analysis method was employed to analyse the interview data. Quantitative results showed that there was significant improvement in accuracy scores for lob (t = 2.21, p = .04), serve (t = 4.65, p < .001), total scores for lob (t = 3.15, p = .01), and total scores of underarm serve (t = 3.98, p < .001). Participants believed that the group-based RP enabled them to improve skill consistency that lead to better performance. It also improved their self-confidence, self-awareness, and increased their motivation in learning the sport.