The Irish Film and Television Award for Best Supporting Actor was an award bestowed by the Irish Film & Television Academy celebrating outstanding performances by actors in supporting roles in films and television dramas.
It was a joint category until 2005, where actors were nominated from films and television dramas for the same award.
The 3rd Irish Film & Television Awards introduced the current separate categories: Irish Film & Television Award for Best Actor in a Supporting Role - Film and Irish Film and Television Award for Best Actor in a Supporting Role - Television.