| First Name | Oleg |
| Last Name | Cassini |
| Full Name at Birth | Oleg Loiewski |
| Age | 92 (age at death) |
| Date of Birth | April 11, 1913 |
| Birthplace | Paris, France |
| Date of Death | March 17, 2006 |
| Location of Death | Long Island, NY |
| Cause of Death | Complications from stroke |
| Build | Slim |
| Eye Color | Hazel |
| Hair Color | Black |
| Star Sign | Aries |
| Ethnicity | White |
| Nationality | American |
| University | Academia Belle Arte, Florence, Italy |
| Occupation Category | Fashion Designer |
| Claim to Fame | Fashion designer |
| Father | Count Alexander Loiewski |
| Mother | Countess Marguerite Cassini |
| Brother(s) | Igor Cassini |
| Other Family Members | Arthur Paul Nicholas Cassini (grandfather) |
Oleg Cassini (April 11, 1913 – March 17, 2006) was a French-born American fashion designer noted for being chosen by Jacqueline Kennedy to design her state wardrobe in the 1960s.
Selected Oleg Cassini film and TV show credits: