Marc Seguin (20 April 1786 – 24 February 1875) was a French engineer, inventor of the wire-cable suspension bridge and the multi-tubular steam-engine boiler.

[1][2] At the 1823 Exposition des produits de l'industrie française a model was exhibited of a planned suspension bridge which would span the Rhône from Tain-l'Hermitage to Tournon-sur-Rhône.

[3] Shortly after the Stockton and Darlington Railway in England opened (1825) he visited it and observed George Stephenson's Locomotion in operation and acquired two of his engines, which however proved unreliable in French conditions.

Inventor and entrepreneur, teaming with his brothers, Camille, Jules, Paul and Charles, as well as his brother in law Vincent Mignot he continued his father's successful business in textiles, paper, gas-lighting, coal mines, construction and added to it a railroad company and a bridge construction business.

Marc Seguin was voted into the Académie des Sciences in 1845, was made a Knight (Chevalier) of the Légion d'honneur in 1836 and an Officer in 1866, and wrote numerous books on the use of physics and mathematics in building bridges and locomotives engines.