Charles " Joseph " Emile Koechlin (Mulhouse, December 6th 1796 - October 25th 1863), known under the name of Koechlin-Schlumberger following his marriage with Caroline Schlumberger, was a French industrialist and politician.

Grandson of Samuel Koechlin, one of the cofounders of Mulhousian textile industry, and wire of Josué Koechlin, mayor under the First Empire, Joseph Koechlin-Schlumberger ensured the direction of the Mulhousian spinning mill " Schlumberger, Grosjean and Compagnie " (on the site of the " Dentsch"). Cofounder of the Industrial society of Mulhouse (SIM), it of it was the first bibliothécaire.
Formed at the school of Pestalozzi to Yverdon, it expressed a real scientific spirit as a Géologue amateur.

Withdrawn of the businesses at fifty-five years, it was named mayor of Mulhouse in 1852, after having been city council man during many years.
Il contributed then to the cleansing of municipal finances and modernized its city by equipping it in particular with schools of district, of a vocational school (1854), of a new place on the market (place of Peace), and while making complete the outfall channel undertaken by Emile Dollfus.
More open with regard to the catholics than his predecessor, it supported the construction of their new church (Saint-Etienne, place of Peace). It is as under its mandate as Mulhouse became a sub-prefecture (1857).

Joseph Koechlin-Schlumberger was also general adviser of the Haut-Rhin.

His/her son-in-law, Jean Mieg, was mayor of Mulhouse between 1872 and 1887.