Political colours are colours used to represent a political ideology, movement or party, either officially or unofficially. They represent the intersection of colour symbolism and political symbolism. Politicians making public appearances will often identify themselves by wearing rosettes, flowers, ties or ribbons in the colour of their political party. Parties in different countries with similar ideologies sometimes use similar colours. As an example the colour red symbolises left-wing ideologies in many countries (leading to such terms as "Red Army" and "Red Scare"), while the colour blue is often used for conservatism, the colour yellow is most commonly associated with liberalism and right-libertarianism, and Green politics is named after the ideology's political colour.

The political associations of a given colour vary from country to country, and there are exceptions to the general trends, for example red has historically been associated with Christianity, but over time gained association with leftist politics, while the United States differs from other countries in that conservatism is associated with red and liberalism with blue. Mass media has driven a standardisation of colour by political party, to simplify messaging, while historically the colour a candidate chose to identify with could have been chosen based on other factors such as family or regional variations.

Black is primarily associated with anarchism (see anarchist symbolism); black is a lack of colour, and anarchism is a lack of a state. It is used in contrast of national flags, to instead represent universal anarchism. Black is also used to a lesser extent to represent ideologies on the opposite end of the spectrum: fascism (see Blackshirts and Schutzstaffel/Gestapo) and jihadism (see Black Standard).

The colours black and red have been used by anarchists since at least the late 1800s when they were used on cockades by Italian anarchists in the 1874 Bologna insurrection, and in 1877 when anarchists entered the Italian town Letino carrying red and black flags to promote the First International. During the Spanish Civil War the CNT used a diagonally half strip of black and red, with black representing anarchism and red representing the labour movement and the worker movement. The flag was quickly adopted by other anarchists, with the second colour used to distinguish specific anarchist philosophies: anarcho pacifism with white, green anarchism with green, anarcho-syndicalism and anarcho-communism with red, mutualism with orange, and anarcho-capitalism with yellow, while black alone typically represents 'anarchism without adjectives'.

During the Golden Age of Piracy, the black flag, or Jolly Roger of pirates such as Blackbeard and Samuel Bellamy became popular symbols of piracy. The flags represented death and no quarter to those who did not surrender. The Crossed Swords Jolly Roger, falsely attributed to John Rackham, has become a popular and recognisable symbol of pirates, particularly of pirates of the Americas. The skull and bones also became a hazardous symbol to display poisons such as cyanide, Zyklon B and other toxic substances. The black flag of piracy would later influence the symbols of anarchism, such as the symbols of the Makhnovshchina and the Kronstadt rebellion. The rise of internet piracy led to the symbols of the golden age of piracy becoming widely adopted, becoming the symbols of pirate sites such as the Pirate bay. Black becoming a colour to represent pirate parties.

Black was also used by some anti-racist and Black nationalist parties, such as the Black Panther Party in the United States and the Popular Unity in Brazil.

Blue is usually associated with centre-right or conservative parties, originating from its use by the Tories (predecessor of the Conservative Party) in the United Kingdom. Blue is used by many international organisations of centre right and conservative parties, such as the International Democrat Union, the Democrat Union of Africa, the Asia Pacific Democrat Union, the Caribbean Democrat Union (together with red), the European Democrat Union, the European People's Party, the European Conservatives and Reformists Party.

Brown has been associated with Nazism, and in particular the Nazi Party in Germany, because of the Sturmabteilung (SA), whose members were called "brown shirts". They were modelled on Benito Mussolini's blackshirts, and the colour of their shirts was chosen because many brown uniforms intended for the colonial troops in Germany's African colonies were cheaply available after the end of World War I. In Europe and elsewhere, the colour brown is sometimes used to refer to fascists in general.