<P> Except for the two states with opt outs, all current and future members of the EU are obliged to adopt the Euro as their currency, thus replacing their current ones . The relationship between euro and non-euro states has been on debate both during the UK's membership (as a large opt - out state) and in light of withdrawal from the EU and how that impacts the balance of power between those in and out of the euro; namely avoiding a eurozone caucus out - voting non-euro states . The UK had called for the EU treaties to recognise the EU as a "multicurrency union", which sparked concerns about undermining euro adoption in remaining countries . </P> <P> The following are official and unofficial currencies used within the borders of the European Union; </P> <Table> <Tr> <Th> Currency </Th> <Th> Region </Th> <Th> Symbol </Th> <Th> ISO </Th> <Th> Peg </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Bulgarian lev </Td> <Td> Bulgaria </Td> <Td> лв </Td> <Td> BGN </Td> <Td> Currency board </Td> <Td> </Td> </Tr> <Tr> <Td> British pound sterling Gibraltar pound </Td> <Td> United Kingdom Gibraltar </Td> <Td> £ </Td> <Td> GBP GIP </Td> <Td> Floating Pegged to pound sterling </Td> <Td> </Td> </Tr> <Tr> <Td> Croatian kuna </Td> <Td> Croatia </Td> <Td> kn </Td> <Td> HRK </Td> <Td> Floating </Td> <Td> </Td> </Tr> <Tr> <Td> Czech koruna </Td> <Td> Czech Republic </Td> <Td> Kč </Td> <Td> CZK </Td> <Td> Floating </Td> <Td> </Td> </Tr> <Tr> <Td> Danish krone </Td> <Td> Denmark </Td> <Td> kr </Td> <Td> DKK </Td> <Td> ERM II </Td> <Td> </Td> </Tr> <Tr> <Td> Euro </Td> <Td> Eurozone (show) <Ul> <Li> Austria Belgium Cyprus Estonia Finland France Germany Greece Ireland Italy Latvia Lithuania Luxembourg Malta Netherlands Portugal Slovakia Slovenia Spain </Li> </Ul> </Td> <Td> € </Td> <Td> EUR </Td> <Td> Floating </Td> <Td> Also used by EU institutions </Td> </Tr> <Tr> <Td> Hungarian forint </Td> <Td> Hungary </Td> <Td> Ft </Td> <Td> HUF </Td> <Td> Floating </Td> <Td> </Td> </Tr> <Tr> <Td> Polish złoty </Td> <Td> Poland </Td> <Td> zł </Td> <Td> PLN </Td> <Td> Floating </Td> <Td> </Td> </Tr> <Tr> <Td> Romanian leu </Td> <Td> Romania </Td> <Td> Leu </Td> <Td> RON </Td> <Td> Floating </Td> <Td> </Td> </Tr> <Tr> <Td> Swedish krona </Td> <Td> Sweden </Td> <Td> kr </Td> <Td> SEK </Td> <Td> Floating </Td> <Td> </Td> </Tr> <Tr> <Td> Swiss franc </Td> <Td> Campione d'Italia (Italy) Büsingen am Hochrhein (Germany) </Td> <Td> Fr . </Td> <Td> CHF </Td> <Td> Floating </Td> <Td> Swiss franc is issued by Switzerland . </Td> </Tr> <Tr> <Td> Turkish lira </Td> <Td> Northern Cyprus (Cyprus) </Td> <Td> TL </Td> <Td> TRY </Td> <Td> Floating </Td> <Td> Tukrish lira is issued by Turkey </Td> </Tr> </Table> <Tr> <Th> Currency </Th> <Th> Region </Th> <Th> Symbol </Th> <Th> ISO </Th> <Th> Peg </Th> <Th> Notes </Th> </Tr>

What is the official currency of the eu
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