Cynthia Adler (born May 23, 1946) is an American actress and puppeteer. Her voice roles for Hanna-Barbera included:
- Maid Marian in Robin Hoodnik
- Supporting voices on The Amazing Chan and the Chan Clan
- A supporting voice in "Chet's Fiancée", an episode of Wait till Your Father Gets Home
In July 1990, Adler created and produced an educational radio advertisement for the Environmental Bond Act along with Joy Golden and Meir Ribalow.
Adler has been married to John Henry Cox since 1994.