Mercury Vindicated from the Alchemists at Court is a Jacobean-era masque, written by Ben Jonson and designed by Inigo Jones. It was performed at Whitehall Palace on Twelfth Night, 6 January 1615. King James I liked it so much that he ordered a repeat performance the following Sunday, 8 January. The masque was initially published in the first folio collection of Jonson's works in 1616, and was included in the collected works from that point on.