Porphyry (Greek Πορφύριος "purple-clad") may refer to:

• Saint Porphyry of Gaza, bishop of Gaza ca. 347–420.
• Porphyry of Tyros (c. 233–c. 305), a Neoplatonic philosopher.
• Porphyry, a very hard red, green or purple igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix (groundmass).