Koch can refer to the following:

• Edward I. Koch - former Mayor of New York City
• Karl Koch, a German hacker from the 1980s - see hagbard (Karl Koch)
• Carl Ludwig Koch and his son Ludwig Koch - German biologists
• Carl Wilhelm Otto Koch , (1810 - 1876), mayor of Leipzig
• Christof Koch
• Dorothy Bush Koch
• Erich Koch - Gauleiter of East Prussia
• Helge von Koch - Swedish mathematician, originator of the eponymous Koch curve
• Howard Koch
• Ilse Koch - wife of Karl, "The Bitch of Buchenwald"
• Joseph Anton Koch
• Karl Koch - German botanist
• Karl Koch - German film director and writer
• Karl Otto Koch - the first commandant of Buchenwald
• Marita Koch - sprint athelete, born 1957
• Robert Koch - German physician, discoverer of the tubercle and cholera bacilli, Nobel Prize in Medicine laureate in 1905
• Roland Koch
• Walter Karl Koch - a German surgeon
• Werner Koch

Also

• Koch - A type of arctic boat
• Koch - A language spoken in India and Bangladesh
• Koch - a town in Texas
• Koch is German for chef and cook
• Koch Entertainment, owner of Koch Records