Uncial 0172 (in the Gregory-Aland numbering), is a Greek uncial manuscript of the New Testament, dated palaeographically to the 5th century.

[1] The codex contains a small parts of the Epistle to the Romans 1:27-30,32-2:2, on one parchment leaf (14 cm by 11 cm).

[1] The Greek text of this codex is a representative of the Alexandrian text-type.

[1][2] Facsimile of this fragment was published by M. Naldini ad Guglielmo Cavallo.

[3] The codex currently is housed at the Laurentian Library (PSI 4) in Florence.