The flag of Kuwait (Arabic: علم الكويت) was adopted on 7 September 1961, and officially hoisted 24 November 1961. Before 1961, the flag of Kuwait was red and white, like those of other Arab states of the Persian Gulf at the time, with the field being red and words or charges being written in white. It is the only national flag featuring an acute trapezium.

When the Utub settled in Kuwait, Kuwaiti ships were flying a flag common on the western coast of the Persian Gulf, a red flag with a serrated white ribbon added near the mast, similar to the current Bahrain flag, and was called the Sulaimi flag. This flag was raised in the rule of Sheikh Sabah I bin Jaber in 1752 and was used to 1871.

During the period of Ottoman rule in Kuwait, the Ottoman flag, red with a white crescent and star, was used. This flag was retained after the country became a British protectorate in the Anglo-Kuwaiti Agreement of 1899.

In 1903, Lord Curzon, the British Viceroy and Governor-General of India visited Kuwait, and Sheikh Mubarak Al-Sabah received him and raised a red flag with white words, توكلنا على الله (We trust in God) in Arabic writing. This avoided the diplomatic faux pas, given Kuwait was under British protection, of raising the Ottoman flag. Wikipedia