The Guitar Lap-Strap is used to support a musical instrument, guitar or other portable musical instrument, while the instrument player is in a sitting or crouched position. The strap is designed to reduce the potential for downward or forward slippage of the instrument. The front playing surface of the guitar or instrument rests against the proximate or rear surface of the soft protrusion of the Guitar Lap-Strap, and requires no conforming to the instrument contour. The strap is adjustable and is secured around the individuals right or left mid-thigh utilizing a snap-lock buckle or other connector. A suede-like or cotton soft material protrusion called a retainer, is bound on the superior or front portion of the lap-trap which aids in preventing the downward or forward slippage of the instrument, and requires no conforming to the instrument contour. The Guitar Lap-Strap allows the user to support the hand held instrument without the use of a neck strap, foot rest, or other external instrument constraint, other than the players hands.