Polycarp (AD 69-155), was one of the Christian Apostolic Fathers and Bishop of Smyrna.

Polycarp, the Latin Polycarpus, or the Germanized Polykarp may also refer to:

in religion:

• Polycarpus, the conventional title of a compilation of Gregory of San Grisogono
• Polycarp of Alexandria, a 4th-century Christian martyr
• Polycarpus I of Byzantium (died AD 81), Bishop of Byzantium
• Polycarpus II of Byzantium (died AD 144), Bishop of Byzantium
• Polycarp the Archimandrite (died 1182) of the Kiev Caves, an Eastern Orthodox saint
• Polycarpus Augin Aydin (born 1971), Syriac Orthodox Church bishops
• Polykarp Leyser the Elder (1552 – 1610), German Lutheran theologian, superintendent in Braunschweig
• Polykarp Leyser II (1586 – 1633), German Lutheran theologian, superintendent in Leipzig
• Polykarp Leyser III (1656 – 1725), German Lutheran theologian, superintendent, chaplain and orientalist
• Polykarp Leyser IV (1690 – 1728), German Lutheran theologian, philosopher, physician, lawyer and historian

in other uses:

• Johann Christian Polycarp Erxleben (1744 – 1777), German scientist
• Polycarp (children's TV show host), children's TV show host in south Louisiana
• Polykarp Kusch (1911 – 1993), German-American physicist and Nobel laureate
• Saint-Polycarpe, a commune in the Aude department in southern France
• Saint-Polycarpe, Quebec, a municipality in the Vaudreuil-Soulanges Regional County Municipality in the Montérégie region in Quebec, Canada

not to be confused with:

• Polycarpic, a type of plant which reproduces multiple times during its lifetime