The BlackBerry OS is a proprietary software platform, created by Research In Motion, for their BlackBerry phones. The OS is focused on easy operation and was originally designed for business professionals. The Blackberry operating system provides multi-tasking and supports specialized input devices that have been adopted by RIM for use in its handhelds, particularly the trackwheel, trackball, and most recently, the trackpad and touchscreen.

The BlackBerry platform is perhaps best known for its native support for corporate email, through MIDP 1.0 and, more recently, a subset of MIDP 2.0, which and allows complete wireless activation and synchronization with Microsoft Exchange, Lotus Domino, or Novell GroupWise email, calendar, tasks, notes, and contacts, when used in conjunction with BlackBerry Enterprise Server.

The operating system also supports WAP 1.2. Recently it has seen a surge in third-party applications and has been improved to offer full multimedia support.