Vienna Symphonic Library (VSL) is a Vienna, Austria-based developer of orchestral sample libraries and music production software, founded in 2000 by Herbert Tucmandl, a former cellist and composer. The company is headquartered at Synchron Stage Vienna, a landmark-protected recording facility in the city's 23rd district that serves as both the company's base of operations and its primary recording venue. VSL pioneered the concept of creating a complete virtual orchestra within a computer, and their libraries span the full range of orchestral instruments — strings, woodwinds, brass, percussion, choirs, and harps — as well as a notable collection of sampled concert grand pianos.

VSL's product catalog is organized into several major lines. The Synchron Series captures instruments with multiple microphone positions at Synchron Stage Vienna, while the Studio Series (formerly the Vienna Instruments line) features recordings from the company's earlier Silent Stage facility. Flagship software products include Vienna Ensemble Pro, a network-ready mixing host that allows composers to distribute processing across multiple computers; Vienna MIR Pro 3D, a convolution reverb and mixing engine; and the Big Bang Orchestra (BBO) series, which provides full orchestral ensemble patches. The company also offers the Synchron Player and the legacy Vienna Instruments player for hosting its libraries.

VSL's sample libraries are widely used in film, television, and game scoring. Composers such as Hans Zimmer, Danny Elfman, A.R. Rahman, Alan Silvestri, and Alexandre Desplat are among the professional users of VSL products. The company's Synchron Stage is also an official Dolby Atmos recording facility, and VSL was among the first sample library developers to offer instruments in immersive audio formats including Auro-3D.

Vienna Symphonic has 30 products cataloged on Equipboard, including Virtual Instrument, Brass & Woodwind, and Instrument Bundles. Their gear is featured by 23 artists, with the strongest followings in Electronic, Orchestra, and Classical. Notable users include Deadmau5, Grant Kirkhope, and Steve Burke. Vienna Symphonic's catalog spans the full price spectrum — from entry-level options to high-end flagships.