Barton & Guestier is the oldest wine house in , releasing wines from across  produced in partnership with more than 200 winegrowers. It operates on a négociant basis and wines are made at various locations, and are overseen by B&G winemakers.

The company's Bordeaux flagship is Château Magnol in the , a property which also has a food and wine academy and a corporate hospitality hub. A range of other châteaux across the main Bordeaux appellations are also selected and released by B&G. The branded, generic Bordeaux wines include the famous 1725 and French Tom labels, Prince Noir and the Thomas Barton Reserve .

The range of  wines, chiefly marketed under the Passeport range, extends across many the main French winegrowing regions: Bordeaux, the , , ,  and .  (Vin de Pays) wines are sourced from the ,  and Corsica, and an organic range is sourced from the Languedoc and the Loire, as is a range of sparkling wines. The B&G house range, labeled Partager, is comprised of generic European -level wines from fruit sourced from the south of France,  and .

The company originated in 1725 when Irishman Thomas Barton settled in Bordeaux and set up as a wine merchant. In 1802, his grandson Hugh joined forces with Frenchman Daniel Guestier to create a partnership that abides to the present day.