Yes, you can be an organ donor under 18 in most countries, though specific rules vary by location. In the United States, minors can become organ donors, but parental or guardian consent is required since they cannot legally sign documents independently. When a minor registers as an organ donor through their state's DMV or organ donor registry, a parent or legal guardian must authorize the registration.
At the time of death, however, families are still consulted about donation decisions, and parents retain the authority to make final choices about organ procurement, even if the minor had registered as a donor. This two-stage consent process—initial registration plus family consultation at time of death—reflects both the minor's expressed wishes and parental authority.
In the United Kingdom and other countries, similar age-based restrictions apply, typically requiring parental consent for donors under 16 or 18. Some regions have "opt-out" systems where all citizens are presumed donors unless they explicitly register objections, but minors often still require parental involvement.
The key point is that while minors can express their donation wishes and register, the legal framework ensures parental involvement both during registration and at the time of potential donation. This protects minors while respecting their emerging autonomy and their families' input in these significant medical decisions.