David Baruch Adler (16 May 1826 – 4 December 1878) was a Jewish-Danish banker, politician and philanthropist.

He attended Mariboes Realskole before moving to Hamburg at the age of 16 where he received a commercial education as a textile merchant.

Adler was later also a co-founder of several credit and banking houses in Jutland, including Nye Jyske Købstadskreditforening (1871) on the basis of the firm Adler, Wulff & Meyer in Aarhus Jysk Handels- og Landbrugsbank (1876).

He belonged to the National Liberal Party and had close ties to politicians such as Carl Christian Hall, Carl Steen Andersen Bille [da] and Christian Sophus Klein [da].

On 19 December 1849, Adler married Jenny Raphael (11 March 1830 – 13 November 1902) in London.

Their eldest son, Bertil Adler, took on the family firm after his father's death.