KARR may refer to:
- John Mark Karr, former suspect in the JonBenét Ramsey murder case
- Jean-Baptiste Alphonse Karr (French critic, journalist and novelist)
- KARR (AM), a radio station (1460 AM) licensed to Kirkland, Washington, United States
- KARR (Knight Rider), character from the Knight Rider series
- Mary Karr American poet and memoirist
- Aurora Municipal Airport (Illinois) (ICAO code KARR)