Abstract: A golf swing brace which regulates elbow flexing in a manner which is responsive to the golfer's swing so that elbow flexing is prevented before and during golf ball addressment, but is freely permitted thereafter, thus truly simulating for the golfer-in-training proper swing technique. The golf swing brace consists of an upper arm brace and a forearm brace, each mutually pivotally connected together at a pivot. Arm bands attach the upper arm and forearm braces to the respective portions of the golfer's lead arm (left arm in the case of a right-handed golfer). The upper arm and forearm braces are oriented so that the pivot is axially in line with the golfer's elbow. Thus, if the pivot is locked, the golfer cannot bend his or her lead arm at the elbow, but if the pivot is not locked, the golfer is able to freely bend his or her lead arm at the elbow.