The article reviews the principal surviving examples of inscriptions on mosaic pavements and wall-paintings in Roman Britain. For some of these it makes tentative suggestions towards new readings or seeks to adjudicate between the conflicting readings of earlier commentators. The eleven inscriptions examined belong to different classes: signatures, dedications, good luck messages, labels, and literary or pseudo-literary glosses upon figure-scenes. The existence of the inscriptions implies that viewers were expected to be literate, or at least that being literate, if not actually well-educated, was socially important.