| Liepona | |
| Source1 Location: | south of Kybartai |
| Source1 Coordinates: | 54.4937°N 22.7522°W |
| Mouth: | Širvinta |
| Mouth Coordinates: | 54.6844°N 22.7264°W |
| Progression: | Širvinta→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Lithuania, Russia |
| Length: | 35km (22miles) |
| Discharge1 Avg: | 0.65m3/s |
| Basin Size: | 105km2 |
Liepona (German: Lepone, Russian: Lipovka) is a small rivulet that flows for 22.9km (14.2miles) on the border of Lithuania and Kaliningrad Oblast, Russia. Left tributary to Širvinta, Liepona originates in Lithuania, near Kylininkai village. In 1980, a 26ha pond for irrigation was built about 16km (10miles) from the mouth.
It is famous for an incident in June 1940 when President of Lithuania Antanas Smetona had to cross the shallow river in order to reach Nazi Germany in the aftermath of the Soviet ultimatum to Lithuania. Liepona served as a natural border between Prussia and Lithuania since the Treaty of Melno of 1422 with the Teutonic Knights.