Santorini, being a premier island destination in Greece, officially uses the Euro (€) in 2026. As a member of the European Union and the Eurozone, Greece transitioned from the Drachma to the Euro decades ago. In 2026, the island is highly digitized, with the vast majority of tavernas, boutique shops, and tour operators in Oia and Fira accepting major credit cards and mobile payments like Apple Pay or Google Pay. However, carrying some physical Euros remains essential for small purchases at local "peripteros" (kiosks), bus fares on the KTEL network, or tipping service staff. ATMs are widely available across the island, though it is wise to use those affiliated with major Greek banks (like Alpha Bank or Piraeus Bank) to avoid the high convenience fees often charged by third-party "tourist" ATMs. Always choose to be charged in the local currency (EUR) rather than your home currency when using a card terminal to ensure you receive the most favorable interbank exchange rate.