The flag of Mobile, Alabama was designed by Lambert C. Mims and adopted on December 4, 1968. It features a red stripe, a blue stripe, and the city seal all on a White field. It is the current and only flag of Mobile.

The design of the flag was suggested by Commissioner Lambert C. Mims. The Mobile Board of City Commissioners approved of the flag design during a conference meeting on December 4, 1968.

In 2004, the North American Vexillological Association conducted a design survey of 150 selected city flags in the United States. Mobile's flag ranked 76th with a rating of 4.05 out of 10.

The flag is defined by law as:

The field is white. On a width of 6.5 units, a horizontal red stripe of 1 unit runs across the top of the field, about .5 units from the top edge. A blue horizontal stripe of 1 unit runs across the bottom, about .5 units from the bottom edge. In the center of the field is the circular seal of the city, approximately 3 units in diameter.

The flags on the seal represent the six nations that have governed Mobile. The seagull and ship represent how Mobile is among the nation’s 10 major seaports. The cotton bale represents Mobile’s early growth and prosperity. The tall building and water mill represent the many industries that have come to Mobile.

The seal of Mobile, Alabama was adopted in 1961. The seal originally depicted the Confederate battle flag, but in August, 2000, a resolution was passed that replaced the battle flag with the third national flag of the Confederacy.

In 2015, the City Council of Mobile voted to remove 5 of the 6 flags on the seal, leaving only the United States flag.