Louis Boehmer (30 May 1843 - 29 July 1896) was an ethnic German-American agronomist and government advisor in Meiji period Japan who later worked as a success entrepreneur in Yokohama.

In January 1871, when Kuroda Kiyotaka was in the United States hiring foreign advisors for his Hokkaidō Colonization Office, Boehmer was recommended as a horticulturist by a mutual friend of Horace Capron.

Boehmer arrived in Yokohama, Japan on March 23, 1872 and was initially placed in charge of an experimental farm in Aoyama, Tokyo where he raised carrots, potatoes, asparagus, as well as wheat, barley and soybeans.

With the end of the Boshin War, the Japanese government redoubled its efforts to settle Hokkaidō, especially with displaced former samurai from pro-Tokugawa shogunate domains.

While in Saru District, he discovered the local Ainu tribe growing hops, which when combined with locally-grown barley enabled him to recommend to Horace Capon at the nearby Sapporo Agricultural College that a brewery be established.