In brief:Injury data for an intercollegiate lacrosse team were collected after one season of practices and games and compared with injury data from a summer league team. Only five players (15%) completed the season without injury, and there were 78 total injuries to the 34 players. The most frequent injury was ankle sprain. The experience, skills, and age of collegiate athletes are more homogeneous and they often have superior equipment and playing surfaces, which suggests that they should have fewer injuries. However, the authors believe that the competitiveness of collegiate lacrosse results in higher frequency of injury.