The Holy Tunic of Argenteuil (Sainte Tunique d'Argenteuil) is a brown woollen seamless garment, larger than the Coat of Trier, with marks of blood and other bodily fluids consistent with severe wounds. It is preserved at the Basilica of Saint-Denys in Argenteuil, just outside Paris. The tradition is that this is the under-tunic that Christ wore during the scourging and the Crucifixion, distinct from the seamless outer tunic preserved at Trier.
The Argenteuil relic is documented in the abbey from the 9th century, brought to it (according to medieval tradition) by Charlemagne's daughter Theodrada, abbess of Argenteuil. The relic was examined repeatedly through the 19th and 20th centuries, including modern blood-typing and pollen-analysis studies. The blood is human, type AB — the same type identified in the Shroud of Turin and the Sudarium of Oviedo. The pollens identified on the tunic include species native only to the Levant. Exposed for veneration in 1934, 1984, 2016, and 2024.