The invention features a monoblock (non-modular) humeral head (shoulder) resurfacing implant designed to replace a portion of the patient's humeral head. The humeral head may need replacing due to trauma, osteonecrosis, infection, arthritis, or other causes. The implant of the invention is designed to be performed either as a hemiarthroplasty or as a component of a total shoulder replacement along with a standard glenoid or inset glenoid implant.