Pierre Jérôme Honoré Daumet (October 23, 1826, Paris – December 12, 1911, Paris) was a French architect.
Daumet was the winner of the Prix de Rome in 1855, and in 1861 conducted a treasure-hunting expedition to Macedonia at the request of Napoleon III, accompanying the archaeologist Léon Heuzey. On his return he married the daughter of architect Charles-Auguste Questel.
Daumet founded his own atelier which would produce nine further Grand Prix winners, Charles-Louis Girault chief among them, and attracted a number of foreign students such as Charles McKim.
In 1908 Daumet won the Royal Gold Medal of the Royal Institute of British Architects.
Major work includes: