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This article's lead section may be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. (December 2023)

Curta (Type I) mechanical calculator shown in the operational position (left hand). The crank is turned with the right hand.

Curt Herzstark at the 1910 office equipment exhibition in Vienna

Curt Herzstark (January 26, 1902 – October 27, 1988) was an Austrian engineer. During World War II, he designed plans for a mechanical pocket calculator (the Curta).