The flag of Duluth, Minnesota consists of three main sections: a lighter blue that takes up the upper half, a dark green that takes up a quarter below that, and a darker blue in the bottom quarter.

Between the blues and green there are two parallel wavy white lines; each has four valleys and three peaks.

There is an eight-pointed gold star in the sky blue above the first and second peaks in the white lines.

In 2016 the city of Duluth adopted a long-range planning vision called "Imagine 2035".

[1] The green, white and blue represented Duluth's woods, snow and streams.

[3] A blue fleur-de-lis outlined in white was located in the upper left and lower right green quadrants,[1] which were a nod to Daniel Greysolon, Sieur du Lhut, the French explorer for whom the city was named.

[5][6] Between the blues and green are two narrower parallel wavy white lines (fimbriations); each has four valleys and three peaks.

By 2018 the local news were aware of only two: one in the mayor's office and one in the city council chambers.

[2] In January 2019 the community was invited to participate in an open competition to design the flag.