Ploy (Thai: พลอย) is a 2007 Thai film written and directed by Pen-Ek Ratanaruang. The film premiered during the Directors' Fortnight at the 2007 Cannes Film Festival.

The drama film stars Thai actress Lalita Panyopas in a story of a middle-aged married couple who question their relationship after seven years. Ananda Everingham is featured in a supporting role as a bartender.

The film contained sex scenes that were shown at Cannes, but due to censorship concerns had to be re-edited by the director so the film could be shown in cinemas in Thailand when it opened there on June 7, 2007. The uncensored version of the film was shown in Thailand at the 2007 Bangkok International Film Festival.