A year after the premiere of the complete Ring cycle in Bayreuth in 1876, a concert-form ‘London Wagner Festival’ took place at the Royal Albert Hall, newly opened in South Kensington near the site of the Great Exhibition of 1851. Comprising lengthy excerpts from Wagner’s operas performed by a vast orchestra and star singers, this event was partly born out of financial necessity in the aftermath of the costly and extravagant staging of the Ring in Bayreuth. But Wagner’s London connections also reveal the significance of Victorian industry and the built environment in disseminating his music dramas and shaping listening practices beyond Bayreuth. This article situates the London Wagner Festival in relation to the early history of the Royal Albert Hall, foregrounding the contributions and responses of Victorian architects, engineers, concert reformers and musical critics to the peculiarly modern phenomenon of the massive concert. By approaching the Albert Hall as a medium for the early dissemination of Wagner’s music dramas, I seek to make a broader case for the relevance of the nineteenth-century concert hall to histories of operatic performance and technological mediation.