Sultan Bin Saqr Al Qasimi (ruled 1803-1840, 1840-1866; died 1866) was the ruler of the Emirate of Sharjah and Ras Al Khaimah in the Trucial coast (currently known as the United Arab Emirates). He was known as one of the most famous and powerful rulers of the Al Qasimi family in the UAE. He was known for his objection to British interference in the issues of the coast and his attacks against British ships. The United Kingdom, in his time attacked the coast and the fleet of Ras Al Khaimah twice, in 1809 and in 1819. In the end, he agreed to sign the second treaty with the UK, which is known today as the General Maritime Treaty 1820.