Guldynai is a village in Jonava District Municipality, in Kaunas County, Lithuania. Guldynai lies at 31 m above sea level. It has 109 inhabitants (2021). The nearest city is Jonava, 11.5 km to the east. Among the landmarks around are Ninth Fort (18.3 km), M. K. Čiurlionis National Art Museum (19.2 km) and Pažaislis Monastery (17.5 km).