The Persian Gulf campaign of 1809 was an operation by the British East India Company backed by the Royal Navy to force the Al Qasimi to cease their raids on British ships in the Persian Gulf, particularly on the Persian and Arab coasts of the Strait of Hormuz. The operation's success was limited as the Royal Navy forces, already heavily involved in the Napoleonic Wars, were unable to permanently suppress the strong fleets of the Al Qasimi of Ras Al Khaimah and Sharjah. The expedition did achieve its short-term goals by destroying three Al Qasimi bases and over 80 vessels, including the largest Al Qasimi ship in the region, the converted merchant ship Minerva. Although operations continued into 1810, the British were unable to destroy every Al Qasimi vessel. By 1811, attacks had resumed, although at a lower intensity than previously.

The Al Qasimi is an Arab dynasty in the Persian Gulf that rules Sharjah and Ras Al Khaimah, today forming two of the seven emirates of the United Arab Emirates. They are one of the longest reigning royal families in the Arabian peninsula. Historically, they also ruled over the town of Lengeh as sheikhs for a century until its' annexation by Iran in 1887.