3LHD is an architectural firm based in Zagreb, Croatia. The studio was responsible for designing many public and business objects throughout the country and abroad, is known for its simplicity and contemporary visual look in architecture. 3LHD was founded in 1994 by founding partners Sasa Begovic (born 1967 in Bjelovar), Marko Dabrovic (born 1969 in Dubrovnik), Tanja Grozdanic (born 1968 in Zagreb) and Silvije Novak (born 1971 in Rijeka). All partners are graduates from Architectural Faculty, University of Zagreb, Croatia.

3LHD is focused on integrating various disciplines - architecture, urban planning, design and art. Projects, such as Memorial Bridge in Rijeka, Croatian Pavilion in EXPO 2005 in Japan and EXPO 2008 in Zaragoza, Riva waterfront in Split, Sports Hall Bale in Istria, Centre Zamet in Rijeka, Zagreb Dance Centre in Zagreb and Hotel Lone in Rovinj are some of the important highlights.

3LHD architects are actively involved in teaching and have been visiting lecturers and critics in numerous cities and institutions such as ETH in Zurich, Berlage Institute in Rotterdam, RIBA London and Architectural Faculties and Universities. Currently the office partners are Guest Professors at GAF Architectural Faculty, University of Split and at Architecture Faculty, University of Zagreb, Croatia. Their work has been presented in Vienna, London and New York. Given the intense activity of 3LHD in the past ten years, a number of relevant and successful projects are still awaiting realization.