A patient positioner for maintaining a patient's position during a medical procedure is provided. The patient positioner includes a generally rectangular body anchoring portion having a longitudinally disposed head and tail ends and two transversely disposed opposing side ends, placeable atop an operating table, a pair of spaced apart chest straps, a pair of spaced apart table straps, a pair of upper arm straps, and a pair of wrist straps. There is a generally rectangular substrate backing having a longitudinally disposed head and tail ends and two transversely disposed opposing side ends, substantially concentrically disposed on and fixedly attached to the body anchoring portion. In use, the table straps are placed through a break of the operating table and secured to the head end of the operating table to prevent the patient from sliding toward the head end of the operating table in the Trendelenburg position.