Blagaj may refer to:

• Blagaj, Mostar, a village near Mostar, Bosnia and Herzegovina
• Blagaj Fort, a medieval fortress near Mostar
• Blagaj, Donji Vakuf, a village in Bosnia and Herzegovina
• Blagaj, Kupres, a village in Bosnia and Herzegovina
• Blagaj Japra (Blagaj on the Sana), a village near Bosanski Novi, Bosnia and Herzegovina
• Blagaj Rijeka, a village near Bosanski Novi, Bosnia and Herzegovina
• Blagaj, Croatia (Blagaj on the Korana), a village near Slunj, Croatia
• Blagaj Castle (Croatia), a ruined castle on the Korana, Croatia

• Blagaj family, a Croatian, Austrian and Slovenian noble family, cadet branch of the Babonić family
• Rihard Blagaj (1786–1858) Slovene aristocrat and botanist

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