The Alard–Baron Knoop Stradivarius of 1715 is an antique violin made by luthier Antonio Stradivari of Cremona (1644–1737).
It was made during Stradivari's golden period and is regarded as the "finest of the fine," and nec plus ultra by the W.E.
The Alard has the original neck with the initials "PS" found in the mortise of the head believed to be those of son, Paolo Stradivari.
Upon the publication of the Hill brothers' work on Stradivari in 1902, The Alard was in the possession of Baron Knoop (1846–1918).
In the 19th century leading French violin maker Jean-Baptiste Vuillaume made a close copy of the Alard, which today is played by American virtuoso Hilary Hahn.