Flag of Sioux Falls, South Dakota

Flag of Sioux Falls, South Dakota

Use	Civil and state flag
Proportion	3:5[1]
Adopted	July 10, 2018; 6 years ago (2018-07-10)
Design	A zigzag pattern of thin white and blue lines, which divides an upper blue portion and a lower pinkish-red portion, and a yellow sun in the upper left corner
Designed by	Max Rabkin

The flag of Sioux Falls, South Dakota, consists of a zigzag pattern of thin white and blue lines, which divides an upper blue portion and a lower pinkish-red portion, and a yellow sun in the upper left corner. The zigzag represents the namesake falls of the Big Sioux River. The blue color and the sun allude to the flag of South Dakota. The pinkish-red portion represents the Sioux Quartzite nearby. The upward direction of the design represents the growth of Sioux Falls. The red, white and blue colors included in the flag are also a reference to the flag of the United States while maintaining city and state pride.

In 2004, the North American Vexillological Association (NAVA) rated the design of flags from the 100 largest cities in the U.S., all 50 state capitals and at least two cities per state. Sioux Falls did not have an entry in the rating because it did not have a flag.

The flag of Sioux Falls was designed in 2014 by Max Rabkin. It was chosen as the winner of a design competition for both the "Best in Show" by a panel of experts and the "People's Choice" award. The city officially adopted the flag in 2018. In a 2022 NAVA survey, the flag received an A grade and was rated in the top 25 of over 300 flags introduced since 2015.