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Arvutihiir, commonly known as a computer mouse, is a pointing device used to interact with a computer's graphical user interface. It allows users to move a cursor or pointer on the screen and select, click, or drag objects. The most common type of mouse uses an optical sensor to detect movement across a surface. Earlier versions utilized a rolling ball mechanism.

Modern mice typically feature at least two buttons: a primary (left) button for selection and a secondary (right) button for context menus, and often a scroll wheel for navigating documents and web pages. Wireless mice transmit signals to the computer via radio frequency or Bluetooth, eliminating the need for a physical cable.

The concept of the mouse was first developed by Douglas Engelbart in the 1960s, with commercial production beginning in the 1970s. Its adoption alongside the development of graphical user interfaces revolutionized computer interaction, making computers more accessible and intuitive for a broader audience. Ergonomic designs have also become prevalent, aiming to reduce strain during extended use. Variations exist, such as trackballs, which are stationary with a movable ball, and touchpads, integrated into laptop keyboards.