Flag of Montgomery County, Maryland
The current flag of Maryland's Montgomery County.  | |
| Use | Other | 
|---|---|
| Proportion | 2:3 | 
| Adopted | October 5, 1976 | 
| Design | A rectangle, three parts wide and two parts tall, quartered by a crenellated line, separating the top two quarters from the two bottom quarters, and a straight vertical line, separating the left two quarters from the two right quarters, with the upper left and lower right quarters consisting of a gold fleur-de-lis on a blue background, with the upper right and lower left quarters consisting of a gold ring with a blue gem on a red background, with a crenellated line formed of 11 squares, 1/11 of flag length, with center block split in middle with left side red and right side blue, with rings and fleur-de-lises to be three times as high as a block in the crenellated line with width proportional, with rings and fleur-de-lises centered horizontally on their quarters and spaced vertically so that upper and lower edge of rings and fleur-de-lises at equal distance from the horizontal outside edge of quarter and nearest part of crenellated line. | 
| Designed by | College of Arms | 
The former flag of Montgomery County, Maryland, used from May 3, 1944 to October 5, 1976.  | |
| Use | Other | 
| Adopted | May 3, 1944 – October 5, 1976 | 
| Designed by | Lilly Catherine Stone | 
The current flag of Montgomery County, Maryland was adopted on October 5, 1976. It was designed by the British College of Arms. It is commonly flown outside of the Montgomery County's governmental facilities, such as fire stations.
The flag is based on the coat of arms of the Montgomery family, a scion of which, Richard Montgomery, gave the county its name. It is the county's second flag, replacing the first one, which had been in use from May 3, 1944, until its replacement in 1976.