Giacomo Devecchi (born April 2, 1985), also called Jack Devecchi, is an Italian professional basketball player for Dinamo Sassari in the Italian Lega Basket Serie A (LBA).

Giacomo Devecchi made his debut in Lega Basket Serie A with Olimpia Milano in 2001.

In 2004 he went to Sutor Montegranaro, but he was later loaned to Dinamo Sassari in 2006 in the second-tier of the Italian league pyramid, Serie A2.

[1] With Dinamo Sassari he achieved the promotion to LBA beating 3–1 Veroli Basket in the playoffs.

[2] At the end of the 2011-12 season his team got the 4th place in the League table, and they were eliminated just at the playoffs' semifinals.