关节镜（英Arthroscopy）是观察关节的状态的内视镜、相当于胃镜的关节版。

实用的关节镜于1950年代在东京递信病院由整形外科部长渡边正毅等开発而在全世界范围推广开来。

Arthroscopy (also called arthroscopic surgery) is a minimally invasive surgical procedure on a joint in which an examination and sometimes treatment of damage is performed using an arthroscope, an endoscope that is inserted into the joint through a small incision. Arthroscopic procedures can be performed to evaluate or treat many orthopaedic conditions including torn cartilage (known by health professionals as "meniscus"), torn surface (articular) cartilage, ACL reconstruction, and trimming damaged cartilage.