Alexander Behm (11 November 1880, in Sternberg (Mecklenburg) – 22 January 1952, in Tarp (Schleswig-Flensburg)) was a German physicist who developed working ocean echo sounder in Germany at the same time Reginald Fessenden was doing so in North America.
As head of a research laboratory in Vienna (Austria) he conducted experiments concerning the propagation of sound.
He tried to develop an iceberg detection system using reflected sound waves after the Titanic disaster on 15 April 1912.
In 1920 he founded the Behm Echo Sounding Company in Kiel in order to commercialise his invention.
He was also a fanatic angler and an inventor of fishing tackle, like Behm-Fliege and Behm-Blinker.