General William Carr Beresford, 1st Viscount Beresford, 1st Marquis of Campo Maior, GCB, GCH, GCTE, PC (2 October 1768 – 8 January 1856), is a British soldier and politician.

A general in the British Army and a marshal in the Portuguese army, he fights with the Duke of Wellington in the Peninsular War and holds the office of Master-General of the Ordnance in 1828 in Wellington's first ministry.