Croatian Lodge "Herceg Stjepan Kosača" (Croatian: Hrvatski dom Herceg Stjepan Kosača) is a city-sponsored public institution in Mostar, Bosnia and Herzegovina, which promotes, assists and organizes educational and art events.

It was designed by the modernist Sarajevo architect Reuf Kadić and the construction work began in 1959.

[1] The Croatian Lodge "Herceg Stjepan Kosača" building is located in the city center (Rondo area) and it houses a public library, cafe-bar and a music school.

The programme, managed and organized by the Croatian Community, includes classical, pop and modern music concerts, theatre, puppet shows, exhibitions, cinema reviews, poetry readings, book and CD music presentations.

The Croatian Lodge "Herceg Stjepan Kosača" premises include the following:[1] A number of cultural events frequently take place in The Croatian Lodge "Herceg Stjepan Kosača" and there are art exhibitions, music performances or poetry readings happening almost daily.