| Birth Date: | 21 December 1877 |
| Birth Place: | Leeguste, Gemeinde Saara, Governorate of Livonia, Russian Empire |
| Death Date: | 23 August 1954 (aged 76) |
| Death Place: | Tartu, Estonia |
| Field: | Mathematics |
| Workplaces: | University of Tartu |
Jaan Sarv (vro|Sarvõ Jaan; 21 December 1877 – 23 August 1954) was an Estonian mathematician and educator. Most of his life he worked as a professor at the University of Tartu. Sarv laid the foundation of Estonian language mathematical education.