| Gaižiūnai | |
| Settlement Type: | Village |
| Pushpin Map: | Lithuania |
| Pushpin Map Caption: | Location of Gaižiūnai |
| Subdivision Type: | Country |
| Subdivision Name: |  Lithuania |
| Subdivision Type1: | Ethnographic region |
| Subdivision Name1: | Aukštaitija |
| Subdivision Type2: | County |
| Subdivision Name2: | Kaunas County |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Jonava district municipality |
| Subdivision Type4: | Eldership |
| Subdivision Name4: | Dumsiai eldership |
| Established Date: | 1604 |
| Established Title: | First mentioned |
| Population As Of: | 2011 |
| Population Total: | 167 |
| Coordinates: | 55.0361°N 24.3306°W |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Gaižiūnai is a village in Jonava district municipality, Lithuania. It is situated on the Taurosta River, tributary of Neris, about 3km (02miles) southeast of Jonava and 25km (16miles) northeast of Kaunas. The railroad from Šiauliai forks into Kaunas and Vilnius near the village. Gaižiūnai is also known as a military base.
The old military training ground in Varėna could not be used by the Lithuanian Army as it was too close to the demarcation line with Poland and stirred Polish protests.[1] Therefore in 1930 the army bought some 80km2 of land, mostly pine forest, bog, and sandy soil unsuitable for agriculture. The new training grounds included an airfield, railway connection, and numerous buildings for the soldiers.[1] In 1939, according to the Soviet–Lithuanian Mutual Assistance Treaty, about 5,000 Russian soldiers were stationed in the military base.[2] [3] After World War II, the Soviets expanded the base and built a military town in Rukla. When Lithuania regained its independence, the base was adopted by the Lithuanian Armed Forces. The facility is known as Gaižiūnai Training Area (Lithuanian: Gaižiūnų poligonas).