Leitz may refer to several German companies:

• Esselte Leitz GmbH & Co KG, founded by Louis Leitz in 1896, a German manufacturer of office products
  • Louis Leitz (1846–1918), German inventor and founder of Esselte Leitz GmbH & Co KG
• Leitz GmbH & Co. KG, founded by Albert Leitz in 1876, a German manufacturer of machine tooling for wood and plastics
• Ernst Leitz GmbH, founded by Ernst Leitz, a former German firm now divided into three independent companies:
  • Leica Camera, manufacturer of cameras
  • Leica Geosystems, manufacturer of geodetic equipment
  • Leica Microsystems, manufacturer of microscopes and owner of the Leica brand

• Jesuit High School, Portland, Oregon
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