Ada Sara Adler (18 February 1878, Frederiksberg – 28 December 1946, Copenhagen) 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). She also contributed several articles to Pauly–Wissowa's Realencyclopädie.
Her father's sister, Ellen Adler Bohr, was the mother of Niels Bohr and Harald Bohr.
During World War II, she was evacuated to Sweden with other Danish Jews. She taught Greek in the Danish school in Lund.
In 1916, she published a catalog of Greek manuscripts in the Royal Library, Copenhagen. In 1931, she was awarded the Tagea Brandt Rejselegat. At the time of her death she had made substantial progress towards a first edition of the Etymologicum Genuinum, a project continued under the direction of Klaus Alpers.
- 1916: Catalogue supplémentaire des manuscrits grecs de la Bibliothèque Royale de Copenhague.
- 1917: D. G. Moldenhawer og hans haandskriftsamling, Copenhagen