Adrien Lachenal (19 May 1849 in Geneva – 29 June 1918) was a Swiss politician and Jurist. He was president of the Swiss Confederation in 1869.
Married to Anne Louise Eggly in 1878, he had four sons. He was affiliated to the Free Democratic Party. He was a Freemason,[1] and belonged to the Masonic lodge "Fidélité et Prudence" in Geneva.[2] Lachenal is buried at the Cimetière des Rois, Geneva.[3]