Dunja Košutić was born in Osijek and began her musical education under Mirko Hrženjak before continuing her studies with Davor Reba at the Zagreb Academy of Music. As part of the Erasmus programme, she also studied with Chen Halevi at the Staatliche Hochschule für Musik Trossingen. She pursued postgraduate studies at the Royal Northern College of Music in Manchester (UK) with the full scholarship support of the British Leverhulme Trust Foundation, studying under Nicholas Cox and Antonio Salguero. Additionally, she participated in masterclasses with renowned musicians such as Gábor Varga, Yehuda Gilad, and others.
Throughout her career, she has collaborated with the Croatian Chamber Orchestra, Mala Scena and Binocular Theater, the Nederlands Blazers Ensemble in Amsterdam, and the Hallé Symphony Orchestra in Manchester.
Since 2019, she has been a member of the Zagreb Philharmonic Orchestra and was recently appointed clarinet section leader.