This article is about the city in Romania. For other meanings, see Iași (disambiguation).

Iași [jaʃʲ] Audio-Datei / Hörbeispielpronunciation? /i (German Jassy, obsolete Jassenmarkt, Russian Яссы Jassy, Hungarian Jászvásár, Armenian Յասի Jassi, Turkish Yaş) is a university town in northeastern Romania in the Moldavian region and the capital of the county of the same name. Historically it was the most important city of the Principality of Moldova and later the second most important city in Romania, today it is the seat of the Northeast Planning Region.

Iași is the fourth largest city in Romania with 290,422 inhabitants (2011) and is considered by some to be the "cradle of Romanian culture". Many Romanian personalities and artists lived here.