George Vaughan Maddox (1802–27 February 1864) was a nineteenth-century British architect and builder, whose work was undertaken principally in the town of Monmouth, Wales, and in the wider county.

For two decades from the mid-1820s he put up a sequence of public buildings and private houses in the town, in a style deft, cultured, and only occasionally unresolved.

[8] A range of slaughterhouses, the Shambles, comprising 24 rooms with openings onto the river so that their waste would drain directly into it, were sited beneath the sandstone arches of the viaduct.

[14] The local historian, Keith Kissack notes that Maddox designed new side galleries for St Mary’s in 1824 but this work was removed in George Edmund Street’s remodelling of the 1880s.

[33] Cadw suggests that Maddox was also the architect of the main block of Piercefield House, near Chepstow, working to designs by Sir John Soane.