Myositis ossificans circumscriptus (MOC) or heterotopic ossification is a rare, benign soft tissue proliferation characterized by non-neoplastic heterotopic bone formation. It commonly occurs in young, adult male athletes, and is often, but not always, associated with trauma. Muscle and soft tissue, especially flexor muscles in the upper extremities and thigh, are commonly affected. MOC rarely occurs in the head and neck. The histological features of MOC have been well documented. However, few reports describe the cytological findings. Here we report the cytological features of myositis ossificans of the neck clinically presenting as a supraclavicular mass.