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'Ertuğrul' ('أرطغرل'), also 'Ertoğrul' (with title 'Ertuğrul Gazi'), (1198 – 1281) was the father of Osman I, the founder of the Ottoman Empire. 'Ertugrul Gazi' was the leader of the Kayi clan of the Oghuz Turks.
In 1227 he inherited the command of the Kayı tribe of the Oghuz Turks following the drowning of his father, Süleyman Shah, in the river Euphrates, fleeing from the Mongol onslaught. Ertuğrul was given the lands of Karaca Dağ, a mountain near Angora (now Ankara), by Ala ad-Din Kay Qubadh I, the Seljuk Sultan of Rüm. Later he was also given the village of Söğüt with the surrounding lands. That village became the Ottoman capital in 1299 under Ertuğrul's son Osman I.
Like his son and descendants, Ertuğrul is often referred to as a ''Ghazi,'' a champion fighter for the cause of Islam.
In the 19th century, the Ottoman Navy frigate ''Ertuğrul'' was named in his honor.