Sheikh Sultan bin Saqr Al Qasimi (1781–1866) was the Sheikh of the Qawasim and ruled the towns of Sharjah, Ras Al Khaimah, Jazirah Al Hamra and Rams; all within the then Trucial States and now part of the United Arab Emirates. Briefly a dependent of the first Saudi Kingdom, his rule over Ras Al Khaimah ran from 1803–1809, when he was deposed by order of the Saudi Amir and restored in 1820, going on to rule until his death in 1866 at the age of 85. He was Ruler of Sharjah from 1814–1866, with a brief disruption to that rule in 1840 by his elder son Saqr. He was a signatory to various treaties with the British, starting with the General Maritime Treaty of 1820 and culminating in the Perpetual Maritime Truce of 1853.

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.