The rarest blood type in the world is called Rhnull , often nicknamed “golden blood,” with only a few dozen known people having it globally. Among the usual eight blood types (A, B, AB, O with + or −), the rarest is AB negative , found in well under 1% of people.

Quick Scoop: Rarest Blood Type

  • Absolute rarest overall: Rhnull (no Rh antigens at all on red blood cells; only around 40–50 documented individuals worldwide, making it extraordinarily rare).
  • Rarest of the “main eight” types: AB−, which appears in less than 1% of the population in places like the United States.
  • Why Rhnull is special: Because it lacks all Rh antigens, it can sometimes be used to help people with very unusual Rh variants, which is why it is called “golden blood.”

Information gathered from public forums or data available on the internet and portrayed here.