The flag of Texas is the official flag of the U.S. state of Texas. It is well known for its prominent single white star which gives the flag its commonly-used name: "Lone Star Flag". This lone star, in turn, gives rise to the state's nickname: "The Lone Star State". The flag, flown at homes and businesses statewide, is highly popular among Texans and is treated with a great degree of reverence and esteem within Texas. Along with the flag of Hawaii, it is one of two state flags to have previously served as a national flag of an independent country. In 2001, the North American Vexillological Association surveyed its members on the designs of the 72 U.S. state, territorial, and Canadian provincial flags and ranked the Texas flag second, behind New Mexico.

The Republic of Texas, or simply Texas, was a sovereign state in North America that existed from March 2, 1836, to February 19, 1846. It shared borders with Mexico, the Republic of the Rio Grande, and the United States of America.