Ada Adler (1878-1946) was a Danish classical scholar and librarian.

She is best known for her critical, standard edition of the Suda, which she published in 5 volumes (Leipzig, 1928-1938). To Pauly-Wissowa's Realencyclopädie she contributed several articles.

In 1916 she published a catalogue of Greek manuscripts in the Royal Library, Copenhagen. In 1931, she was awarded the Tagea Brandt Rejselegat.