Various examples of a wearable sensor enclosure are described. In an example, a wearable sensor enclosure is generally oval-shaped with rigid interior that protects one or more sensors or other electronic devices. The enclosure includes a proximal component and a distal component. The proximal component of the enclosure optionally includes one or more openings for light to pass through for detection by sensing electronic devices. The distal component includes a protrusion positioned in an interior of the distal component and a lip positioned in along the perimeter of the distal component such that the lip surrounds the protrusion.