Firearm suicides among adolescents have increased in the US and rates vary across racial and ethnic groups. In this study, we examined contextual information around adolescent firearm suicides and analyzed how incident characteristics vary across racial and ethnic groups. We analyzed firearm suicides among adolescents (ages 10-18 years) from 2004 to 2020 using data from the National Fatality Review-Case Reporting System (NFR-CRS). There were 4,153 firearm suicides during that period. Suicides often involved males, older adolescents (15-18 years), and handguns. Most firearms belonged to the primary caregiver and incidents frequently occurred at home. However, we found that characteristics varied substantially across racial and ethnic groups. Overall, we provide new information on firearm suicides among adolescents in the US using a larger dataset than previous studies and found significant differences in characteristics and demographics across racial and ethnic groups. This finding suggests the need for tailored prevention strategies.