In recent years, the sport of ice hockey has grown in participation and popularity. Subsequently, there is a greater interest in the risk of injuries associated with participation, particularly concussions at the high school level. PURPOSE: To examine the concussion rates and mechanisms in high school boys’ ice hockey in the 2008/09-2015/16 school years. METHODS: Data were obtained from the National High School Sports-Related Injury Surveillance System (HS RIO) during the 2008/09-2015/16 school years. HS RIO used a convenience sample of high school boys’ ice hockey programs. Athletic trainers provided detailed reports on injuries and athlete-exposures (AE). Injury rates per 1,000AE, injury rate ratios (IRR), and injury proportion ratios (IPR) with 95% confidence intervals (CI) were calculated. RESULTS: Overall, 323 concussions were reported during the 2008/09-2015/16 school years, of which most occurred during competition (85.4%) and in-season (92.9%). These concussions were reported across 467,278AE, for a concussion rate of 0.69/1,000AE. The concussion rate was higher in competition than practice (1.75 vs. 0.15/1000AE; IRR=11.51; 95%CI: 8.45, 15.68). Most concussions were due to contact with another player (47.1%), followed by contact with the boards/glass (31.6%). Concussions occurred while being checked (36.5%), skating (28.2%), and chasing a loose puck (10.5%). Most concussions occurred in wings (47.1%), followed by defensemen (28.5%) and centers (11.5%). When comparing injury mechanism distributions between being checked and checking, the proportion of concussions due to contact with another player was higher in checking than being checked (68.8% vs. 41.5%; IPR=1.66; 95%CI: 1.12, 2.45). Of the seven concussions sustained by goalies, 42.9% were due to contact with the puck; in comparison, no concussions among all other competition positions had concussions reported to be due to contact with the puck. CONCLUSION: Concussions in high school boys’ ice hockey occur mainly in competition and result from player contact. These concussions appear to be position dependent with the highest incidence occurring to wings. Examination of adaptations to the checking rule or teaching the checking technique may lead to a reduction in concussive events.