Agatha ("Aagje") Deken (1741 in Nieuwer-Amstel – 14 November 1804, in The Hague) was a Dutch writer.
In 1775, Deken published the collection of poems Stichtelijke gedichten, which she had written together with Maria Bosch.
1776 saw the beginning of a correspondence between Aagje Deken and Betje Wolff, who had already published several works by that time.
They published the successful novel Sara Burgerhart and Historie van den heer Willem Leevend.
Not quite at ease with the political situation in the Netherlands, when the Patriot faction lost power, they moved to Trëoux in Burgundy in 1788.