头部穿孔（Trepanation），又称颅骨穿孔术或环锯术，是一种外科手术干预法，在头皮与头盖骨上钻或挖一个孔，令到头颅的硬膜外露，以处理颅内疾病或其他相关的健康问题。人们相信这种方法可以释放颅内过大的压力，而根据许多民族的神秘主义者及新纪元运动信徒相信，在头盖骨上打洞，可以提升感应能力。在十八世纪的欧洲，头部穿孔是一种民间疗法，用来治疗精神病或其他与头脑相关的病变。但由于缺乏科学依据，这项手术慢慢被现代医学所鄙弃。

Trepanning, also known as trepanation, trephination, trephining or making a burr hole (the verb trepan derives via Old French via Medieval Latin from the Greek noun of relevant meaning trypanon, literally "borer, auger") is a surgical intervention in which a hole is drilled or scraped into the human skull, exposing the dura mater to treat health problems related to intracranial diseases. It may also refer to any "burr" hole created through other body surfaces, including nail beds. It is often used to relieve pressure beneath a surface. A trephine is an instrument used for cutting out a round piece of skull bone.