European Union: kids debate whether to stay in or leave
22 June 2016 Last updated at 10:02 BST
Today is the last day for people to decide if they think the UK should remain in, or leave, the group of 28 countries called the European Union.
Tomorrow's vote could mean big changes for people living in the UK and in other EU countries.
Ricky visited a school who are debating whether to stay in or leave the EU.