An ad campaign launching in January will feature the actor modelling Dunhill's spring/summer 2008 menswear collection and Poacher leather goods. Law has previously appeared in advertising for the brand in Asia.
Dunhill, which specialises in clothing and accessories, has six stores in the UK, including outlets in Selfridges and Harvey Nichols.
It also has a branded 'den' at Silverjet's private terminal at Luton Airport, which features vintage leather sofas and tables made out of aluminium aircraft fuel tanks.