Kristjan Oja
| Personal information | |
|---|---|
| Nationality | Estonian | 
| Born | 8 August 1968 Tallinn, Estonia  | 
| Sport | |
| Sport | Biathlon | 
Kristjan Oja (born 8 August 1968) is an Estonian former biathlete. He competed in the men's 20 km individual event at the 1992 Winter Olympics. His daughter is biathlete Regina Ermits.