Paul Klein

• Paul Klein (missionary), Czech Jesuit missionary in the Philippines, pharmacist and Cavite College rector, often referred to as Pablo Clain, or Paulus or Pavel Klein
• Paul L. Klein, developer of pay-per-view TV channels and creator of the least objectionable program theory
• Paul Klein (chess player), German–Ecuadorian chess player
• Paul Klein (art dealer), American art activist from Chicago
• Paul Klein, musical theatre composer who collaborated with the lyricist Fred Ebb
• Paul Klein (musician), frontman of LANY