Introduction Turkey is constitutionally secular with a Muslim majority. There is no legal basis for limiting life-support at the end-of-life (EOL) in Turkey. We aimed to investigate the opinions and attitudes of intensive care unit (ICU) physicians regarding EOL decisions, for both their patients and themselves, and to evaluate if the physicians' demographic and professional variables predicted the attitudes of physicians toward EOL decisions. Methods An online survey was distributed to national critical care societies' members. Physicians' opinions were sought concerning legalization of EOL decisions for terminally ill patients or by patient-request regardless of prognosis. Participants physicians' views on who should make EOL decisions and when they should occur were determined. Participants were also asked if they would prefer cardiopulmonary resuscitation (CPR) and/or intubation/mechanical ventilation (MV) personally if they had terminal cancer. Results A total of 613 physicians responded. Religious beliefs had no effect on the physicians' acceptance of do-not-resuscitate (DNR) / do-not-intubate (DNI) orders for terminally ill patients, but atheism, was found to be an independent predictor of approval of DNR/DNI in cases of patient request (p<0.05). While medical experience (�6 years in the ICU) was the independent predictor for the physicians' approval of DNI decisions on patient demand, the volume of terminal patients in ICUs (between 10-50% per year) where they worked was an