Rahasia ("secret" in Indonesian) is an extremely rare and valuable Dungeons & Dragons-compatible module, and is often considered the first role-playing adventure of any kind authored soley by a woman.

Rahasia was first published in 1979 by Daystar West Media, Tracy Hickman's private publishing company, and no more than 200 copies were ever printed. The first edition was part of the "Night Ventures" line, along with Pharoah. Daystar West Media was purchased by TSR in 1981, and as a result the intended third volume of the Night Ventures series, Eye of the Dragon, was never published. However, a second edition of Rahasia was released by TSR in 1983 as the first exclusive Role-Playing Gamers Association (RPGA) tournament module, RPGA1: Rahasia (Pharoah in turn was heavily modified and in 1982 became I3: Pharoah). In 1984, RPGA1: Rahasia was merged with the second tournament module RPGA2: Black Opal Eye, and the combined adventure was released as B7: Rahasia.

At least two earlier adventures were co-authored by woman, but the first edition of Rahasia was credited soley to Laura Hickman, a first in the industry. However, both the RPGA version and the version included in B7: Rahasia are credited to "Tracy and Laura Hickman", and if this is considered to be a retroactive correction, the first adventure authored soley by a woman becomes the controversial first edition of B3: Palace of the Silver Princess, by Jean Wells.