The Boston Sax Shop is a boutique saxophone retailer and accessory maker founded by Jack Finucane in Allston, Boston, Massachusetts. Finucane started the business as a one-man repair shop after graduating college in 2013, and has since expanded it into a full storefront dealing in new and vintage horns, alongside an in-house line of saxophone accessories designed for professional players. Repairs, horn trials, and mouthpiece consultations are handled by appointment at their Brighton Avenue location.

The shop's house-brand products include proprietary reed lines (Black Label, Red Label, Silver Label, and Blue Label) in soprano, alto, tenor, and baritone cuts, along with mouthpiece series such as the S-Series, M-Series, R-Series, and E-Series. Other signature products include the Superlative ligature, the Newbury Street and Cloud neckstraps, the Heritage Neck replacement necks, and the Ambassador hard case. In collaboration with saxophonist Chad LB, the shop also launched the Nexus tenor saxophone.

Boston Sax Shop has built a following in the professional jazz community, with endorsers including Ben Wendel, Melissa Aldana, Braxton Cook, Jeff Coffin, and Joel Frahm. The brand is known for a player-first design approach, with Finucane's background as both a performing saxophonist and a repair technician shaping the R&D behind each product.

Boston Sax Shop has 6 products cataloged on Equipboard, including Reeds, Mouthpieces, and Ligatures. Their gear is featured by 7 artists, with the strongest followings in Rock, Jazz, and Folk, World, & Country. Notable users include Jeff Coffin, Mike Wilbur, and Jake McMurchie.