- We have no eternal allies, and we have no perpetual enemies. Our interests are eternal and perpetual, and those interests it is our duty to follow.
speech, House of Commons, 1 March 1848
- As the Roman, in days of old, held himself free from indignity, when he could say Civis Romanus sum; so also a British subject, in whatever land he may be, shall feel confident that the watchful eye and the strong arm of England will protect him against injustice and wrong.
in the debate on the protection afforded to the Greek trader David Pacifico (1784–1854) who had been born a British subject at Gibraltar
speech, House of Commons, 25 June 1850; see Cicero
- You may call it combination, you may call it the accidental and fortuitous concurrence of atoms.
on a projected Palmerston–Disraeli coalition
speech, House of Commons, 5 March 1857
- How d'ye do, and how is the old complaint?
reputed to be his greeting to all those he did not know
A. West Recollections (1899)
- Lord Palmerston, with characteristic levity had once said that only three men in Europe had ever understood [the Schleswig-Holstein question], and of these the Prince Consort was dead, a Danish statesman (unnamed) was in an asylum, and he himself had forgotten it.
R. W. Seton-Watson Britain in Europe 1789–1914 (1937) ch. 11
- What is merit? The opinion one man entertains of another.
Thomas Carlyle Shooting Niagara: and After? (1867)
on being told there was no English word equivalent to sensibilité:Yes we have. Humbug.
- Die, my dear Doctor, that's the last thing I shall do!
last words; E. Latham Famous Sayings and their Authors (1904)