Summary.  Occasional claims have been made that some of the names on Roman military brick stamps could be those of civilian entrepreneurs tiling for the Roman army, most recently in the case of a stamp of Legio XX Valeria Victrix from Tarbock (Liverpool). This paper analyses these claims and investigates the evidence for interaction between the Roman army and civilians in brick production. The texts of the stamps and the archaeological context of the bricks and literary sources, which give information about the role of the army and civilian bodies in Roman provincial building, are taken into consideration.