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为人类学上表示活体的头部顶面观形状所用的术语，在用于颅骨的时候正确的叫法为颅型。通常头型的表达方法，用头长宽指数或头指数来表示。头指数 =（头最大宽／头最大长）× 100，一般在 70-100之间，超出这个范围的很少。根据头指数，分头型如上。活体的头指数比颅骨的颅指数大，这是由于覆于头骨的软组织的厚度影响所致。头型也有不根据测量而根据观察进行分类的。塞奇（ G． Sergi）将头型分为类椭圆形、类五角形、类菱形、类卵圆形、类梯形、类球形和类盾形等七种。
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