Harriett Litchfield or Miss Sylvester Hay (4 March 1777 – 11 January 1854) was a British actress.

She reputedly received a letter from Robbie Burns inviting her back to Scotland after she went there in 1793.

After a brief gap she returned to acting in 1796 and she appeared in a benefit performance for Mary Ann Yates in 1797 at The Haymarket.

On 22 March 1802, she appeared in a one woman show at The Haymarket called The Captive by "Monk" Lewis.

Litchfield was complimented for her delivery "in the most perfect manner" as she plays a woman denied any human contact and kept in a modern dungeon.