Carl Kellner
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Carl Kellner could refer to:
- Carl Kellner (optician), (1829 – 1855), German inventor of the "Kellner eyepiece" and founder of a company for optical instruments that would later become the Leitz company, producers of the Leica cameras.
- Carl Kellner (mystic), (1851 – 1905), Austrian mystic, and "spiritual father" of the Ordo Templi Orientis.