Gündüz Bey, Osmanlı Devleti'nin kurucusu Osman Gazi'nin ağabeyi ve Ertuğrul Gazi'nin oğludur. Oğuzların Bozok koluna mensup Kayı Boyu'na ait olan Gündüz Bey, İnegöl Savaşı'nda şehit düşmüştür.
Popüler kültürde Kuruluş Osman dizilerinde Emre Basalak tarafından canlandırılmıştır.1234
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