The Emirate of Umm Al Quwain (UAQ; Arabic: أم القيوين; pronounced [ʔumː alqajˈwajn]) is one of the seven constituent emirates of the United Arab Emirates, located in the north of the country. It is the second smallest and least populous emirate in the UAE and borders the Persian Gulf. Umm Al Quwain lies between Ras Al Khaimah and Sharjah/Ajman on the west coast, with a location along the vital trade route between the Middle East and India. It has a coastline stretching to 24 km (15 miles).

The Emirate of Umm Al Quwain was formed in 1775, when Sheikh Majid Al Mualla established it as an independent sheikhdom. The emirate is now ruled by Saud bin Rashid Al Mualla. The current crown prince is Rashid bin Saud bin Rashid Al Mua'lla, and the deputy ruler is Abdullah bin Rashid Al Mualla III. It had 72,000 inhabitants in 2007 and has an area of 770 km² (300 sq mi).

The emirate consists in the main of the coastal city of Umm al-Quwain and the inland oasis town of Falaj Al Mualla, some 30 km (19 mi) from the coast. The Population of the Emirate is 49,159 according to the census of December 2005. The city of Umm Al Quwain is the capital of the Emirate.

Unlike some of its neighbours, Umm Al Quwain has not made any significant find of oil or gas in its territory and depends on revenue from hotels, parks and tourism, fisheries and general trading activities as well as the Umm Al Quwain Free Zone (UAQFTZ) based at Port Ahmed Bin Rashid.

A number of government initiatives and strategies have been put in place to incentivise growth in trade and industrial activity in the emirate, including a 2018 move to reduce government fees to business and waive fines and violations levied against businesses which had not renewed their trade licenses.