This study was carried out on macrofungi samples collected from Ataturk Dam Lake basin, especially from the southern coasts, within the boundaries of Sanliurfa province between 2003 and 2013. A total of 122 taxa belonging to 38 families were identified. Six of them are new for the mycobiota of Turkey. Sowerbyella rhenana (Fuckel) J. Moravec is new at the genus level, while Peziza pseudoviolacea Donadini, Peziza ripensis E.C. Hansen, Cheilymenia theleboloides (Alb. & Schwein.) Boud., Galeropsis desertorum Velen. & Dvorak, and Tulostoma melanocyclum Bres. are new at species level.