thumb|The Duke of Bedford, painted by [[Thomas Gainsborough in , around whom the Bloomsburg Gang coalesced]]
The Bloomsbury Gang was an 18th-century socio-political group of British aristocrats, initially centered around the influential statesman John Russell, 4th Duke of Bedford and his Bedfordite allies. While born out of Whiggism and contemporarily aligned to the Whig interest, the group were subsequently identified as "Conservative Whigs" and have been described as a re-emergence of a Tory-Court party leadership following the end of the Tories as an effective political entity in 1760. The group took its name from Bloomsbury, a district of central London now in the London Borough of Camden and the location of the Duke of Bedford's townhouse.
The Bloomsbury Gang emerged as a political grouping between 1765 and 1768. At this stage, the Bedford-Gower-Weymouth faction controlled around 32 personal followers in the House of Commons of Great Britain, while the Earl of Sandwich controlled a further 14 to 18 members of parliament. In doing so, they formed the basis of the political opinion which saw the British political settlement under a constitutional monarch as well balanced, a belief which would strongly influence politicians such as William Pitt the Younger. The Bloosmbury Gang, alongside the wider Bedfordite faction, ceased to exist as a distinct political group following the victory of the Pittites in the 1784 British general election.