
The Australian Anti-Transportation League Flag is a flag used historically by members of the Australasian Anti-Transportation League who opposed penal transportation to the British colonies which are now a part of Australia. It is particularly significant as it is the oldest known flag to feature a representation of the Southern Cross with the stars arranged as they are seen in the sky.

The Canadian Duality Flag is an unofficial flag that was originally circulated to demonstrate the unity of Canada during the lead-up to the 1995 Quebec referendum, at rallies for the "no" side. The Duality Flag design was chosen to represent explicitly the Francophone and Anglophone populations on the national flag by adding blue stripes to the red sections, roughly in proportion to the number of Canadians who are primarily French-speaking. The blue was chosen as it is the main colour that is used on the flag of Quebec.

The Disability flag, Overcoming flag or Flag of the Rights of Persons with Disabilities is a flag that represents people who have disabilities. It was created by the Valencian dancer Eros Recio in 2017 and then presented to the United Nations. The flag is meant for general use, particularly at disability centered events. It has been especially used for the International Day of Persons with Disabilities.

The Doug flag, also referred to as the Cascadian flag or the Cascadia Doug flag and nicknamed "Old Doug" or simply "the Doug", is one of the primary symbols and an unofficial flag of the Cascadia bioregion, which roughly encompasses the U.S. states of Oregon, Idaho, and Washington, the Canadian province of British Columbia, and other parts of North America's Pacific Northwest. It was designed by Portland, Oregon native Alexander Baretich in the academic year of 1994–1995. It is named after the Douglas fir, featured on the flag.

The Ecology Flag is a cultural symbol used primarily in the 1970s by American environmentalists. It is a symbol of people's commitment to clean up the environment.

The Eureka Flag was flown at the Battle of the Eureka Stockade, which took place on 3 December 1854 at Ballarat in Victoria, Australia. It was the culmination of the 1851–1854 Eureka Rebellion on the Victorian goldfields, where miners protested against the cost of mining permits and the officious way the colonial authorities enforced the system along with other grievances. An estimated crowd of over 10,000 demonstrators swore allegiance to the flag as a symbol of defiance at Bakery Hill on 29 November 1854. Twenty-two miners were officially listed as killed at the Eureka Stockade, along with seven troopers and police. Around 120 miners were arrested, and many others badly wounded.

The federalist flag, also known as the Flag of the European Movement, is a flag commonly used by groups or individuals promoting European federalism, consisting of a large green "E" upon a white field. It was designed as the flag of the European Movement, but is no longer used by it.

The Free Speech Flag is a symbol of personal liberty used to promote freedom of speech. Designed by artist John Marcotte, the flag and its colors correspond to a cryptographic key which enabled users to copy HD DVDs and Blu-ray Discs. It was created on May 1, 2007, during the AACS encryption key controversy.

The Gadsden flag is a historical American flag with a yellow field depicting a timber rattlesnake coiled and ready to strike. Beneath the rattlesnake are the words: "Dont Tread on Me". Some modern versions of the flag include an apostrophe.

The "Hertensteiner Cross" was used as a flag by the federalist movements from 14 to 24 September 1946 in Hertenstein, Switzerland.

There have been several designs for a peace flag.

A rainbow flag is a multicolored flag consisting of the colors of the rainbow. The designs differ, but many of the colors are based on the spectral colors of the visible light spectrum. When Isaac Newton first saw a rainbow through a prism, he labeled the colors red, orange, yellow, green, blue, indigo, and violet. However, when not seen through a prism, the color he deemed "blue" is actually blue-green, or cyan, what he called "violet" is today known as dark blue, and "indigo" is a normal blue.

In politics, a red flag is predominantly a symbol of socialism, communism, Marxism, trade unions, left-wing politics, and historically of anarchism. It has been associated with left-wing politics since the French Revolution (1789–1799).

The transgender pride flag is a light blue, pink and white striped flag, designed by American trans woman Monica Helms in 1999, and is a symbol of the transgender community, organizations, and individuals.

The Morning Star flag was a flag used in a supplemental fashion on Netherlands New Guinea to the flag of the Netherlands. It was first raised on 1 December 1961 prior to the territory coming under administration of the United Nations Temporary Executive Authority (UNTEA) on 1 October 1962.