On One Hand: Arches Are Typically AllowedIn general, arches will be allowed in a Catholic wedding ceremony. According to the Catholic Wedding Help website, wedding decorations should never distract from the wedding liturgy or interfere with the parish’s normal decorations. Additionally, decorations should never be placed on the altar. A simple, understated wedding arch can typically be placed in the front of the altar or at the back of the church.On the Other: Your Parish May Not Allow ItSome parishes may not allow wedding arches, so check with your parish office first. If wedding arches are not allowed, do not attempt to bring one into the church. Also, wedding arches that are distracting will typically not be allowed in a Catholic wedding ceremony.Bottom LineIn most cases, wedding arches are allowed for a Catholic wedding ceremony. However, the arch should not be distracting and should not require you to move the church’s existing decorations.