The role of third-party politeness, in the sense of (im)politeness that pertains not (primarily) to the face of the addressee but is aimed at the face of a third party, has not received much attention in politeness studies, but plays an important role in public interaction in the Late Roman Republic. Both in private letters, which often circulated in a wider circle, and in speeches we find courtesies to or critical remarks about ‘others’ that were clearly meant to be heard or read by the persons involved. As such, third-party politeness appears to have been one of the complicated ways in which the Roman elite maintained and shaped their social relations. After a brief discussion of the various forms of third-party politeness, three case studies, concerning Cicero’s relations with Vatinius, Appius and Dolabella, serve as a first exploration of the phenomenon. It turns out that third-party politeness can be used to fulfil the same interpersonal functions which were discussed by Hall (2009) with regard to addressee-oriented politeness, viz. affiliative politeness, politeness of respect and compensation for FTAs.