Oratorio della Via Crucis nel Foro Romano is a lost 18th century Baroque oratory that used to stand just to the right of the Temple of Romulus in the Roman Forum (this building used to be part of Santi Cosma e Damiano). It fitted tightly into the gap between that edifice and the Basilica of Maxentius.
It was built after 1753 under Pope Benedict XIV for a confraternity of priests known as the Amanti de Gesù e Maria al Monte Calvario (Lovers of Jesus and Mary on Mount Calvary). They were responsible for the liturgical and sacramental aspects of celebrations in the Colosseum, especially the Stations of the Cross. Processions for the latter used to start here. This confraternity was based at the church of San Gregorio dei Muratori.
Despite its small size, this was a lavishly decorated little church with a two-storey Baroque façade flanked by gigantic pilasters and crowned by a projecting triangular pediment. The interior was narrow and rectangular, and proportionally very high.
It was pointlessly demolished in 1877 as part of the "archaeological" nationalist campaign to remove any post-imperial architectural features from the Roman Forum. It was already known that it was sitting on an ancient Roman street, the Clivus ad Carinas, and so there was no genuine archaeological need to remove it. Very few descriptions of the Roman Forum mention its former existence.