Letocetum is the remains of a Roman settlement. It was an important military staging post and posting station near the junction of Watling Street, the Roman military road to North Wales, and Icknield (or Ryknild) Street (now the A38). The site is now within the parish of Wall, Staffordshire, England. It is owned and run by the National Trust, under the name Letocetum Roman Baths Site & Museum. The site is in the guardianship of English Heritage as Wall Roman Site.
The Romans came to Letocetum in 50 CE to establish a fortress during the early years of the invasion of Britain. The land could not support large amounts of soldiers and Letocetum, at an important cross-roads, became a large scale posting station. The settlement developed with successive bath houses and mansiones built to serve the official travellers as well as the growing civilian population. It is known mainly from detailed excavations in 1912–13, which concentrated on the sites of the mansio and bath-house, but there is evidence of a substantial settlement with possible basilica, temples, and amphitheatre.