Yanbu (Arabic: ينبع), also known as Yambu or Yenbo, is a city in the Al Madinah Province of western Saudi Arabia. It is approximately 300 kilometres north-west of Jeddah. Many residents are foreign expatriates working in the oil refineries and petrochemical industry, mostly from Asia, but there are also large numbers from the Middle East, Europe, and North America. Yanbu has three primary sections; Yanbu Al-Bahr, Yanbu Al-Nakhl and Yanbu Al-Sina'iya as well as a major Red Sea port.
Yanbu is an important petroleum shipping terminal and is home to three oil refineries, a plastics facility and several other petrochemical plants. It is the country's second port and serves as the main port for the holy city of Medina, 160 km (99 mi) to the east. The natural harbour is protected on both sides by wide coral reefs. These reefs remain mostly untouched, making them excellent areas for diving. Three major oil pipelines lead across the desert from the oil fields in the east to terminate at the Red Sea in Yanbu.
Although the city is known for its industrial activities, it is now growing as a touristic destination.
Yanbu has a population of over 222,360 people.