| Oliviero Vojak | |
| Birth Date: | 24 March 1911 |
| Birth Place: | Pula, Austrian Littoral, Austria-Hungary |
| Death Place: | Turin, Italy |
| Position: | Striker |
| Years1: | 1927–1931 |
| Years2: | 1931–1932 |
| Clubs2: | Napoli |
| Caps1: | 9 |
| Caps2: | 15 |
| Goals1: | 1 |
| Goals2: | 5 |
Oliviero Vojak (24 March 1911 – 21 December 1932) was a professional football player in Italy who played as a striker.
Throughout his career, Vojak played for Italian clubs Juventus (1927–31), and Napoli (1931–32), winning the Serie A title with Juventus in 1931.
Oliviero's older brother Antonio Vojak was also a striker who played for Juventus and Napoli, and even played for the Italy national football team. To distinguish them, Antonio was known as Vojak I and Oliviero as Vojak II.