This study examined the effectiveness of an evidence-based sport parent education programme designed to meet the stage-specific needs of British tennis parents. Using an organisational action research framework, six workshops were run over a 12-week period for tennis parents with children between the ages of 5 and 10 years. Workshops took place in three high performance tennis centres and had an average attendance of 22 parents. Data were collected using participant diaries, emails, social validation feedback forms, reflective diaries, and post-programme focus groups (n=19). The impact and effectiveness of the programme was evaluated qualitatively using a thematic analysis. Results indicated that the programme was effective in enhancing tennis parents’ perceived knowledge, affective states, and skills across a range of learning objectives. Results also provide a unique understanding of parents’ experiences of participating in a sport parent education programme. Insights are provided for practitioners in relation to the design, content, and delivery of future sport parent education programs