Armand Trousseau (14 October 1801 – 23 June 1867) was a French internist.
His contributions to medicine include Trousseau sign of malignancy, Trousseau sign of latent tetany, Trousseau–Lallemand bodies (an archaic synonym for Bence Jones proteins).
He is sometimes credited with the quip "use new drugs quickly, while they still work", though Michel-Philippe Bouvart had said the same over 40 years earlier.