美利坚合众国国旗旗面由13道红白相间的宽条构成，左上角还有一个包含了50颗白色小五角星的蓝色长方形。50颗小星代表了美国的50个州，而13条间纹则象征着美国最早建国时的13个殖民地。红色象征勇气，白色象征真理，蓝色则象征正义。

这面旗帜俗称“星条旗”（Stars and Stripes）、中文俗称「花旗」，正式名称「合众国旗」（The Flag of the United States）。它在正式成为美国国旗后曾经过26次修改。最早期的美国国旗只有13颗星，之后每一个州加入合众国就在国旗上加上一颗星，但是宽条的数目不变。根据1818年4月4日通过的《国旗法案》（Flag Act of 1818），只能在7月4日美国独立日这一天对国旗作出更改。1959年8月21日夏威夷正式成为美国的一个州后，次年国庆日，国旗上的49颗星被改为50颗——这也是美国国旗距今最近的一次修改。

The flag of the United States of America, often referred to as the American flag, is the national flag of the United States. It consists of thirteen equal horizontal stripes of red (top and bottom) alternating with white, with a blue rectangle in the canton (referred to specifically as the "union") bearing fifty small, white, five-pointed stars arranged in nine offset horizontal rows of six stars (top and bottom) alternating with rows of five stars. The 50 stars on the flag represent the 50 states of the United States of America, and the 13 stripes represent the thirteen British colonies that declared independence from the Kingdom of Great Britain, and became the first states in the US. Nicknames for the flag include The Stars and Stripes, Old Glory, and The Star-Spangled Banner.