Koch may refer to:

• Koch (surname), people with this surname
• Koch (boat), a type of Arctic boat
• Koch (language), a language spoken in India and Bangladesh
• Koch method of learning Morse Code
• Koch snowflake or star, and Koch curve
• Koch's postulates
• Koch (Koche), ethnic group of southeastern Nepal

Businesses

• Koch Entertainment LP, owner of Koch Records
• Heckler & Koch, maker of firearms
• Koch Industries, a chemical company
• Koch, ?ód? Voivodeship (central Poland)

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