His father Gottlied Delbrück (1777–1842) worked in Magdeburg. The Delbrück family was a prominent family of Lutheran theologians and lawyers in Prussia. Delbrück studied Lutheran theology and law. After university studies he worked as a lawyer. In 1854, he founded Delbrück Leo & Co. In 1870, Delbrück was a co-founder of German company Deutsche Bank. From 1870 to 1875 Delbrück he was member of Vorstand in Association of German Chambers of Industry and Commerce. Delbrück was member of German Progress Party. Delbrück was married with Luise Jonas (1831–1922). His son Ludwig Delbrück (1860–1913) became leader of company Bank Delbrück Leo & Co..
- Hans-Henning Zabel (1957), "Delbrück, Gottlieb Adelbert", Neue Deutsche Biographie (NDB) (in German), 3, Berlin: Duncker & Humblot, pp. 576–577; (full text online)
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