Clutter may refer to any of the following:
- Excessive physical disorder
- Clutter (organizing), a confusing or disorderly state or collection, and possible symptom of compulsive hoarding
- Visual clutter or visual pollution
- Clutter (radar), unwanted echoes in electronic systems
- Clutter (marketing), numerous advertisements, announcements and promotions in media and radio, unrelated to main presentation
- Clutterers Anonymous, a twelve-step program for people who share a common problem with accumulation of clutter
- Speech
- Cluttering
- Cluttered speech, when speech becomes broken or sounds nervous
- Other
- A clutter in mathematics is a kind of collection of sets
- In computing, Clutter (toolkit) is a graphics library
- The In Cold Blood Clutter Family, murder victims documented in Truman Capote's In Cold Blood
- The Portuguese metal band Clutter (band)