位基服务（Location-Based Service，LBS）又称适地性服务、行动定位服务、位置服务、置于位置的服务，它是通过移动运营商的无线电通讯网络（如GSM网、CDMA网）或外部定位方式（如GPS）获取移动终端用户的位置消息（地理坐标）。在GIS平台的支持下，为用户提供相应服务的一种增值业务。

位基服务可以被应用与不同的领域，例如：健康、工作、个人生活等。此服务可以用来辨认一个人或物的位置，例如发现最近的提款机或朋友同事的目前的位置，也能透过客户目前所在的位置提供直接的手机广告，并包括个人化的天气消息提供，甚至提供在地化的游戏。

Location-based services (LBS) are a general class of computer program-level services that use location data to control features. As such LBS is an information service and has a number of uses in social networking today as an entertainment service, which is accessible with mobile devices through the mobile network and which uses information on the geographical position of the mobile device. This has become more and more important with the expansion of the smartphone and tablet markets as well.