Eugen Viktor Feller (26 January 1871 – 15 November 1936) was a Croatian pharmacist, entrepreneur and pioneer of the industrial drug production in Croatia.

In Donja Stubica, Feller built the pharmaceutical factory, laboratory, and family house with pharmacy.

It was exported in almost all European countries, as well as Egypt, Japan and China, while in the United States it was very popular at the time of Prohibition, due to high percentage of alcohol in its content.

Feller was great philanthropist who financially helped the students, poor families, children and various societies.

In 1918, he opened a trust fund to help the mothers of soldiers who were killed in World War I.