Koch can refer to the following:
- Edward I. Koch - former Mayor of New York City
- Karl Koch - German film director and writer
- Karl Koch, a German hacker from the 1980s - see hagbard
- Walter Karl Koch - a German surgeon
- Karl Otto Koch - the first commandant of Buchenwald
- Ilse Koch - wife of Karl, "The Bitch of Buchenwald"
- Koch - A type of artic boat