Stradivarius refers to the stringed instruments crafted by Antonio Stradivari (c. 1644–1737) and members of his family in Cremona, Italy during the late 17th and early 18th centuries. Although best known for violins, Stradivari produced more than 1,100 instruments across his career — including violas, cellos, guitars, mandolins, and harps — of which roughly 650 are believed to survive. His golden-period instruments, such as the Messiah, Lady Blunt, Soil, and Lipinski violins, are widely regarded as the finest examples of the violin maker's craft and routinely sell at auction or private sale for millions of dollars.

The instruments are prized for their projection, tonal complexity, and responsiveness, qualities that have resisted full scientific explanation despite extensive study of the wood, varnish, and construction methods used. Stradivari's outline patterns — commonly called the "Strad model" — became the de facto template for modern violin making, and most contemporary violins, violas, and student instruments are built on that pattern. Many surviving instruments are owned by foundations, museums such as the Museo del Violino in Cremona and the Smithsonian, or loaned to soloists by patrons.

Stradivarius instruments remain in active concert use by leading classical and crossover string players. Notable performers who have played Strads include Itzhak Perlman, Anne-Sophie Mutter, Joshua Bell (whose violin is the Gibson ex-Huberman), Hilary Hahn, and Yo-Yo Ma on cello (the Davidov). The name has also been licensed and referenced by other instrument makers — most prominently the Bach Stradivarius line of professional trumpets, named in homage by Vincent Bach in the 1920s.

Stradivarius has 3 products cataloged on Equipboard, including Violins. Their gear is featured by 1 artist, with the strongest followings in Rock and Pop. Notable users include William Cooper Glenn.