The Croatian National Theatre is a historic theatre in Zagreb, Croatia. It was founded in 1860, making it the oldest professional theatre in the country. The theatre building was designed by Viennese architects Ferdinand Fellner and Hermann Helmer, and opened in 1895.

The theatre is known for its grandiose facade, which is decorated with sculptures and reliefs depicting characters from Greek mythology, as well as busts of famous Croatian writers and artists. The interior is equally impressive, with a grand staircase leading up to the auditorium, which features ornate decorations and a large chandelier.

The Croatian National Theatre is home to three ensembles: drama, opera, and ballet. The theatre stages a wide variety of productions throughout the year, ranging from classic plays and operas to contemporary works by Croatian and international playwrights.

The theatre has played an important role in the cultural life of Croatia for over a century, and has hosted many famous artists and performers, including composer Franz Liszt and playwright Henrik Ibsen. Today, it remains a popular destination for locals and tourists alike who are interested in the performing arts and cultural heritage of Croatia.