Antoine Vacher (18 November 1873 – 16 September 1920) was a French geographer, mainly interested in physical geography, and particularly in hydrography.

[4] Vacher's fieldwork was mostly concerned with valley forms and measurements of river flows, but he also read widely on oceanography, and wrote on that subject in the Annales de Géographie.

[5] In his time at Lycée Henri-IV, Vacher studied under Henri Bergson, his lecture notes on the 1892-3 course on psychology have been published by PUF.

[4] Vacher collaborated with Albert Demangeon, Joseph Blayac and others on the Dictionnaire-manuel illustré de géographie (Paris, Armand Colin, 1907).

[8] The geographers travelled west via Chicago and Yellowstone to Seattle, south to San Francisco, then returned via Phoenix, Denver, Memphis and Washington, leaving from New York in October 1912.

[12] After the armistice of November 1918 Vacher provided help with maps for the peace negotiations, some of which were added to the collection of the Lille geography department.