Maurice Koechlin (March 8, 1856 - January 14, 1946) was a Swiss structural engineer.

A member of the renowned Alsatian Koechlin family, he was born in Buhl, Haut-Rhin, the son of Jean Koechlin and his wife Anne Marie (Anaïs), née Beuck.

In 1870/1871 when France lost the Franco-Prussian war to Prussia the Koechlin family as a whole decided to become citizens of Switzerland and thus dropped French citizenship. After the defeat of the German Empire in 1918, however, the Koechlin family again applied for French citizenship.

Maurice studied at the lycée in Mulhouse, then between 1873 and 1877 civil engineering at the Polytechnikum Zürich under Carl Culmann. In 1876 he became a citizen of Zurich ("Zürcher Bürger") Between 1877 and 1879 he worked for the French railway company "Chemin de Fer de l'Est".

Much of his work was in the service of Gustave Eiffel's company "Compagnie des Establissments Eiffel", which Koechlin joined in 1879. In 1886 Maurice married Emma Rossier (1867-1965). They had six children: three sons and three daughters. Maurice and Emma were lifelong members of the Plymouth Brethren.

In 1887 he started work on his plans for the "Tour de 300 mètres" in Paris, along with his younger brother Henri Koechlin and civil engineer Émile Nouguier. Maurice Koechlin became the Managing Director of Eiffel's company when Eiffel retired from the engineering profession in 1893. The company also then was renamed "Société de construction de Levallois-Perret".

Maurice Koechlin died in 1946 in Veytaux, Switzerland in a house built by himself in 1900.

Major designs

Major structural designs include:

• Garabit viaduct, (1880–1884);
• Armature for the Statue of Liberty - in collaboration with Frédéric Bartholdi, (1884); and
• Eiffel Tower, (1887–1889).

Honours and legacy

• Officer of the Légion d'honneur.