Rebranding is a marketing strategy in which a new name, term, symbol, design, concept or combination thereof is created for an established brand with the intention of developing a new, differentiated identity in the minds of consumers, investors, competitors, and other stakeholders. Often, this involves radical changes to a brand's logo, name, legal names, image, marketing strategy, and advertising themes. Such changes typically aim to reposition the brand/company, occasionally to distance itself from negative connotations of the previous branding, or to move the brand upmarket; they may also communicate a new message a new board of directors wishes to communicate.

Rebranding can be applied to new products, mature products, or even products still in development. The process can occur through a change in marketing strategy or in various other situations such as Chapter 11 corporate restructuring, union busting, or bankruptcy. Rebranding can also refer to a change in a company or corporate brand that may own several sub-brands for products or companies.

Rebranding became something of a fad at the turn of the millennium, with some companies rebranding several times. The rebranding of Philip Morris to Altria was done to help the company shed its negative image. Other rebrandings, such as the British Post Office's attempt to rebrand itself as Consignia, have proved such a failure that millions more had to be spent going back to square one.

In a study of 165 cases of rebranding, Muzellec and Lambkin (2006) found that, whether a rebranding follows from corporate strategy (e.g., M&A) or constitutes the actual marketing strategy (change the corporate reputation), it aims at enhancing, regaining, transferring, and/or recreating the corporate brand equity.

According to Sinclair (1999:13), business the world over acknowledges the value of brands. “Brands, it seems, alongside ownership of copyright and trademarks, computer software and specialist know-how, are now at the heart of the intangible value investors place on companies.” Companies in the 21st century may find it necessary to relook their brand in terms of its relevance to consumers and the changing marketplace. Successful rebranding projects can yield a brand better off than before. Marketing develops the awareness and associations in the memory of customers so they know (and are reminded) of brands to serve their needs. Once in a lead position, it is marketing, consistent product or service quality, sensible pricing and effective distribution that will keep the brand ahead of the pack and provide value to its owners (Sinclair, 1999:15).

Corporations often rebrand in order to respond to external and/or internal issues. Firms commonly have rebranding cycles in order to stay current with the times or set themselves ahead of the competition. Companies also utilize rebranding as an effective marketing tool to hide malpractices of the past, thereby shedding negative connotations that could potentially affect profitability.

Corporations such as Citigroup, AOL, American Express, and Goldman Sachs all utilize third-party vendors that specialize in brand strategy and the development of corporate identity. Companies invest valuable resources into rebranding and third-party vendors because it is a way to protect them from being blackballed by customers in a very competitive market. Dr. Roger Sinclair, a leading expert on brand valuation and brand equity practice worldwide stated, “A brand is a resource acquired by an enterprise that generates future economic benefits.” Once a brand has negative connotations associated with it, it can only lead to decreased profitability and possibly complete corporate failure. ^{[citation needed]}

Companies differentiate themselves from competitors by incorporating practices from changing their logo to going green. Differentiation from competitors is important in order to attract more customers and an effective way to draw in more desirable employees. The need to differentiate is especially prevalent in saturated markets such as the financial services industry.