Post-nominal letters are letters after a person's name. They are used most in the United Kingdom and other Commonwealth realms to show that the person has a certain:
- job (e.g. JP for a magistrate (Justice of the Peace), or
- title (Kt for a Knight Bachelor or Bt for a Baronet, QC for a Queen's Counselor
- is a member of an order of chivalry e.g. OBE.
Academic degrees (qualifications from a university) can also be shown as postnominal letters, as can military awards (medals and decorations)