The Plain Dealer is a Restoration comedy by William Wycherley, first performed on 11 December 1676.
The play is based on Molière's Le Misanthrope, and is generally considered Wycherley's finest work along with The Country Wife.
Throughout the eighteenth century it was performed in a bowdlerised version by Isaac Bickerstaffe.
The title character is Captain Manly, a sailor who doubts the motives of everyone he meets except for his sweetheart, Olivia, and his friend, Vernish.
When Olivia jilts him and marries Vernish, he attempts to gain revenge by sending a pageboy (who, unknown to him, is a girl named Fidelia in disguise and is in love with him) to seduce Olivia.