In 2026, whether you need a transit visa for a 15-hour layover in Abu Dhabi depends on your nationality and your intention to leave the airport. If you stay within the transit area of Zayed International Airport, no visa is required regardless of your nationality. However, if you wish to exit the airport to visit a hotel or see the Sheikh Zayed Grand Mosque, you will likely need a visa. Many nationalities (including US, UK, and EU citizens) receive a free 30-day visa-on-arrival. If you are from a country that requires a pre-arranged visa (like India), you can apply for a 48-hour transit visa (free) or a 96-hour transit visa (AED 50) through your airline, such as Etihad. Since your layover is over 8 hours, you are eligible for these transit visas provided you have a confirmed onward ticket to a third country.