Jieznas (pronunciationⓘ) is a small city in the Prienai district municipality, Lithuania.

It is located 16 km (9.9 mi) east of Prienai along the northern shores of Lake Jieznas.

Jieznas was first mentioned in written sources in 1492 as property of the Grand Duke of Lithuania.

The palace had 12 halls, 52 rooms, and 365 windows to match the number of months, weeks, and days in a year.

The coat of arms depicts allegorical figure of a woman symbolizing the victory.

Transcribed versions of the Lithuanian name in other languages include Polish: Jezno, Russian: Езно Yezno, Belarusian: Езна Yezna, Yiddish: יעזנע Yiezne.