If you want to have your say in next year's referendum on same-sex marriage you must make sure you're registered to vote.
Two groups have joined forces to promote 'National Voter Registration Day'.
SpunOut.ie and the Union of Students in Ireland say less than one in three young people are currently registered to vote.
They're calling on young people to make sure that they're registered to vote - before the closing date on November 25th.
A number of referendums will be held next year, relating to issues like marriage equality and lowering the voting age.
You have until November 25th to register to vote, and can find out more by clicking here.
You can check the voting register here.
