Baron Denys Marie Pierre Augustin Cochin (1 September 1851 in Paris – 24 March 1922 in Paris) was a French writer and Catholic right-wing politician.
Denys Cochin was the son of Pierre-Suzanne-Augustin Cochin, also a politician and writer.
After graduating from the school Louis-le-Grand, he joined the military as a quartermaster in the eight cuirassier, before becoming flag carrier for General Charles Denis Bourbaki.
After the end of the Franco-Prussian War in 1871, he was an attache in the embassy in London for a year.
Returning to France in 1872, he undertook studies in chemistry in the laboratory of Louis Pasteur.
During World War I, he worked on the development of explosives and chemical weapons.
In 1881 he was elected councilman of the 7th arrondissement of Paris.
From 1893 to 1919, he represented Paris in the French National Assembly.