移动维修系统（Mobile Servicing System，简称MSS，更广为人知的是它主要的部件加拿大臂2）是连接在国际空间站上的1个机器人系统。在空间站的装配和保养上扮演着关键的角色。它在空间站的周围搬运设备和补给，帮助宇航员在太空中工作，在空间站上安装设备和其他载荷。宇航员接受特殊的训练，以使他们能够使用各种系统来完成这些工作。

移动维修系统由空间站远距离机械手（Space Station Remote Manipulator）、移动远距离维修基础系统（Mobile Remote Servicer Base System）、专用灵巧机械手又称“加拿大手”（Special Purpose Dexterous Manipulator）所组成。这个系统由美国提供的运载车装载，能沿着综合性衍架结构的轨道移动。

The Mobile Servicing System (MSS), is a robotic system on board the International Space Station (ISS). Launched to the ISS in 2001, it plays a key role in station assembly and maintenance; it moves equipment and supplies around the station, supports astronauts working in space, and services instruments and other payloads attached to the ISS and is used for external maintenance. Astronauts receive specialized training to enable them to perform these functions with the various systems of the MSS.