The Brit Award for British Alternative/Rock Act is an award given by the British Phonographic Industry (BPI), an organisation which represents record companies and artists in the United Kingdom. The accolade was presented at the Brit Awards, an annual celebration of British and international music. The winners and nominees were determined by the Brit Awards voting academy with over one-thousand members comprising record labels, publishers, managers, agents, media, and previous winners and nominees.

The BRIT Awards are the British Phonographic Industry's annual popular music awards. The name was originally a shortened form of "British", "Britain", or "Britannia", but subsequently became a backronym for British Record Industry Trusts Show. The awards were first held in 1977 and originated as an annual event in 1982 under the auspices of the British record industry's trade association, the BPI. In 1989, they were renamed The BRIT Awards. Mastercard has been the long-term sponsor of the event. In addition, an equivalent awards ceremony for classical music, called the Classic BRIT Awards, was held annually between 2000 and 2013, before being revived in 2018 but has not been held since.