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. There are 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 body anchoring portion is positioned under the patient's torso with the substrate backing side ends wrapped over the arms while the chest straps are brought over the patient's shoulders and criss-crossed over the patient's chest and secured on an opposing side rail while the upper arm and wrist straps are brought from underneath the patient's torso and wrapped over the patient's arms. The table straps are placed through a break of the operating table and secured to a surface underneath the operating table to prevent the patient from sliding toward the head end of the operating table in the Trendelenburg position.