John Charles Pratt, 4th Marquess Camden GCVO TD JP DL (9 February 1872 – 15 December 1943), briefly styled Earl of Brecknock in 1872, was a British peer.

He succeeded to the marquessate at the age of two months on the early death of his father, and was subsequently educated at Eton and Trinity College, Cambridge.

[4] He fought in the First World War as a Major in the West Kent Yeomanry Cavalry, where he was awarded the Territorial Decoration.

[1] Lord Camden married Lady Joan Marion, daughter of Henry Nevill, 3rd Marquess of Abergavenny, in 1898.

[1] His daughter Lady Fiona Pratt married firstly Sir Gerard Fuller, 2nd Baronet and secondly Edward Agar, 5th Earl of Normanton, becoming the mother of the third Baronet and of Shaun Agar, 6th Earl of Normanton.