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A logo flag (also called a branding flag or corporate flag) is a flag displaying the logo or corporate identity of an organization, usually on a plain background, often white or in the organization's primary color. Logo flags are commonly used by companies, non-profit organizations, sports clubs, universities, and public institutions as a means of brand identity, promotion, and identification.^[1]

Logo flags may also be used as territorial flags, to represent a country, administrative division, municipality, or community. Unlike traditional flags, logo flags usually represent the institution or administrative body they belong to more closely than the region or its inhabitants. In many cases, logo flags don't have an official status and are usually not recognised by heraldic authorities. Since the late 20th century, local and regional governments, especially in Europe have increasingly adopted logo flags as official civic symbols, replacing or supplementing traditional flags.

This replacement of traditional flags with logo flags is criticized by vexillologists,^[2] who argue that logo flags often conflict with established principles of flag design,^[3] particularly regarding simplicity, recognizability, and permanence.

When used in a traditional territorial context, logo flags are often criticized by vexillologists because they depart from conventional flag design principles.^[4] In contrast to traditional flags, logo flags frequently include features that are considered less suitable for flags. The North American Vexillological Association's publication Good Flag, Bad Flag^[5] recommends simplicity, meaningful symbolism, and the avoidance of lettering and seals, principles with which logo flags often conflict.

Common criticisms include:

• Lack of permanence: logos and corporate identities usually change over time because the visual styles are tied to contemporary branding trends rather than long-term symbolic traditions, requiring redesign of the flag;
• Poor legibility: text and complex details are difficult to distinguish at a distance;
• Low recognizability when flown: Logos are usually designed for flat surfaces and lose clarity when the flag is flying;
• Reversibility problems: logos and lettering are equally likely to appear correct on the obverse side or mirrored on the reverse side;
• Lack of distinctiveness: many logo flags follow similar design conventions, reducing recognizability further;
• Limited public identification: unlike civic or national flags, logo flags are rarely used by the wider public.

Critics argue that when logo flags are adopted as official municipal or regional flags, they may weaken local historical and cultural symbolism in favor of administrative branding.

Supporters of logo flags argue that they can provide immediate recognition, particularly when an organization's logo is more widely known than its traditional emblem or flag. In official or commercial settings, logo flags may communicate institutional identity more effectively to visitors and the public.

Logo flags are also relatively easy to design and update, making them practical for organizations with evolving visual identities.

Logo flags are widely used in commercial and institutional contexts, particularly at headquarters, office buildings, retail locations, trade fairs, and public events. They serve both practical and symbolic purposes by marking the presence of an organization and reinforcing visual recognition.

In some cases, public authorities such as municipalities, regions, or other administrative bodies adopt logo flags alongside or instead of traditional civic flags. This practice has become more common since the late 20th century with the rise of modern public-sector branding. Many regions of France use logos instead of heraldic symbols, and thus use regional logo flags, although a traditional variant usually exists. In the Netherlands newly formed Dutch municipal flags are logo flags as well.

International organizations commonly use flags with logos, such as UNESCO and OSCE, whose flags function partly as institutional logos while also serving as broader political symbols.

Logo flags are a form of emblematic flag design alongside seal-based flags, the so called seal on a bedsheet, common in the US and many U.S. state flags. In contrast to banners of arms, you also see complete coats of arms placed directly on a plain flag, in a similar design patern of an emblem on a field. The boundaries between these types of flags are not always clear, especially if the main emblem incorporates heraldic elements or the background becomes a more traditional flag.