Gündüz Bey, Osmanlı Devleti'nin kurucusu Osman Gazi'nin ağabeyi ve Ertuğrul Gazi'nin oğludur. Kayı Boyu'na mensup olan Gündüz Bey, İnegöl Savaşı'nda şehit düşmüştür.
Popüler kültürde Kuruluş Osman dizisinde Emre Basalak tarafından canlandırılmıştır.1243
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