| Knut Utstein Kloster | |
| Birth Name: | Ulstein Kloster |
| Birth Date: | 2 April 1929 |
| Birth Place: | Oslo, Norway |
| Nationality: | Norwegian |
| Occupation: | Shipping magnate |
| Known For: | Founding Norwegian Caribbean Line with Ted Arison |
| Spouse: | Trine Kloster |
Knut Utstein Kloster (2 April 1929 – 20 September 2020) was a Norwegian shipping magnate. His grandfather, Lauritz Kloster, founded Kloster Rederi in 1924. In 1959, Kloster joined the family business and transformed it into a leading cruise line. Together with Ted Arison, he founded Norwegian Caribbean Line in 1966.