The Strait of Hormuz /hɔrˈmuːz/ (Arabic: مَضيق هُرمُز‎ Maḍīq Hurmuz, Persian: تَنگِه هُرمُز‎ Tangeh-ye Hormoz) is a narrow, strategically important strait between the Gulf of Oman in the southeast and the Persian Gulf. On the north coast is Iran and on the south coast is the United Arab Emirates and Musandam, an exclave of Oman.

The strait at its narrowest is 21 nautical miles (39 km) wide. It is the only sea passage to the open ocean for large areas of the petroleum-exporting Persian Gulf and is one of the world's most strategically important choke points. Around 20% of the world's oil, which is about 35% of seaborne traded oil, passes through the strait.