Robert Brudenell (20 September 1726 – 20 October 1768) was a British army officer and Member of Parliament.
Brudenell was commissioned as Ensign in the First Foot Guards in 1748, promoted to Captain in 1751, Lieutenant-Colonel in 1758 and Colonel in 1762.
He was also Lieutenant-Governor of Windsor Castle from 1752, and Vice-Chamberlain to Queen Charlotte from 1766 until his death.
However, he took little interest in politics, generally supporting each successive administration so as to avoid any risk to his military advancement.
As he predeceased his childless elder brothers, Brudenell's son, Robert became the 6th Earl of Cardigan.