Poly Phenylene Ether or poly(p-phenylene ether) (PPE) is a high-temperature thermoplastic.

Poly Phenylene Ether is rarely used in its pure form due to difficulties in processing.

Poly Phenylene Ether is mainly used as blend with polystyrene, high impact styrene-butadiene copolymer or polyamide.

PPO is a registered trademark of SABIC Innovative Plastics IP B.V. under which various polyphenylene ether resins are sold.