Coaches are key figures in tackling bullying that can occur in the context of formative sport practice. The aim of the study was to evaluate knowledge about bullying among a sample of coaches in Catalonia (Spain), as well as the prevention strategies available to them. The participants were 161 coaches (75.8% male and 24.2% female) from different sports, with a mean age of 20.3 years (SD = 3.15). They were provided with an ad hoc questionnaire with the following open questions: "How would you define bullying?", "What typologies of bullying exist?" and "What strategies do you use to prevent bullying in sport?". A content analysis was carried out through, on the one hand, a deductive process for the definition of bullying and its typologies; and, on the other hand, an inductive process for prevention strategies. In turn, the frequencies (%) of responses in each of the categories of the different areas were calculated. It was observed that the definition of the phenomenon was vague in terms of key concepts (repetition, intent to harm and power imbalance). The most frequently displayed typology was physical bullying, followed by cyberbullying. Prevention strategies related to promoting a positive climate among athletes were mentioned, and to a lesser extent those related to observation, awareness-raising, regulation, communication, emotional education and conflict intervention. In general, it was found that coaches had little knowledge about bullying, so it was considered relevant that they be given more specific training on the phenomenon.