12 Concerti a cinque (op. 9) is a collection of concertos by the Italian composer Tomaso Albinoni, published in 1722.

The most famous piece from Albinoni's Opus 9 is the Concerto in D minor for oboe (Opus 9, Number 2). It is known for its slow movement. This concerto is probably the second best-known work of Albinoni after the Adagio in G minor (which was once believed to be a reconstruction based on a fragment by Albinoni).