An adjustable finger splint having a main body and slide. The slide configured to move relative to the main body and including a wedge to apply variable pressure to an injured finger to cause the injured finger to extend or straighten. The main body having a proximal interphalangeal platform to support the proximal interphalangeal joint, a metacarpophalangeal platform to support the palm and metacarpophalangeal joint, and a slide platform to support the slide.