Esther Valentine is a fictional character on CBS soap opera The Young and the Restless, portrayed by actress Kate Linder.

Esther has served as Y&R's comic relief and has been Katherine Chancellor's (Jeanne Cooper) maid since 1985.

She is also a trained alcohol abuse counsellor. She once had a one night stand with a plumber named "Tiny" with whom she had a daughter, Kate Tina Valentine, who hasn't been seen since.

Valentine was also indirectly responsible for the death of Katherine's husband, Rex Sterling (Quinn K. Redeker) when she answered a personal ad and met Norman Peterson, a notorious con man.