The Nokia N800 Internet tablet was a wireless Internet appliance from Nokia, originally announced at the Las Vegas CES 2007 Summit in January 2007. The device allows the user to browse the Internet and communicate using Wi-Fi networks or with mobile phone via Bluetooth. The N800 was developed as the successor to the Nokia 770. It includes FM and Internet radio, an RSS news reader, image viewer and a media player for audio and video files.

Note that the USB port uses a mini-B socket instead of mini-AB so that a specially grounded adaptor is required to make full use of the USB OTG client/host auto-switching. Switching can be done in software with regular adaptors, though. USB OTG only provides 100 mA of current (versus full-size USB's 500 mA), so devices with larger current requirements will need to be used with a powered USB hub.

The N800, like all Nokia Internet Tablets, ran Maemo, which was similar to many handheld operating systems, and provided a "Home" screen—the central point from which all applications and settings are accessed. The Home screen was divided into areas for launching applications, a menu bar, and a large customisable area that can display information such as an RSS reader, Internet radio player, and Google search box for example. Maemo was a modified version of Debian.

The N800 was bundled with several applications including the Mozilla-based MicroB browser, Macromedia Flash, Gizmo, and Skype. The N800 used Maemo OS that comes with a number of built-in applications, but additional applications can be installed from a number of sources, including various official and community.