Abu Sa'id Taj ad-Dawla Tutush I (died in 1095) was the Seljuk ruler (probably sultan or emir) of Damascus from 1079 to 1095, succeeding Abaaq al-Khwarazmi. In 1085 he conquered most of Syria from the Great Seljuk Sultan Malik Shah I, but lost it in 1086, only to recapture it in 1094. After his death in 1095, his younger son Duqaq inherited Damascus, causing Duqaq's older brother Radwan to revolt, splitting their father's realm.