The Weir is a play written by Conor McPherson in 1997. It was first produced at The Royal Court Theatre Upstairs in London, England, on 4 July 1997. It opened on Broadway at the Walter Kerr Theatre on 1 April 1999. As well as several other locations in the UK and the U.S., the play has been performed in Ireland, Germany, the Czech Republic, Slovenia, Australia and Canada.

The Royal Court Theatre, at different times known as the Court Theatre, the New Chelsea Theatre, and the Belgravia Theatre, is a non-commercial West End theatre in Sloane Square, London, England. In 1956 it was acquired by and remains the home of the English Stage Company, which is known for its contributions to contemporary theatre and won the Europe Prize Theatrical Realities in 1999.