A uniprocessor (or a uniprocessor system) is a system configuration whereby at most, a single microprocessor used to execute tasks. In such configuration, a single processor is the sole consumer of resources (e.g. memory), although other units such as an IGP may also be incorporated. For this reason this is type of system is sometimes also referred to as a single-socket system. This opposite type of this system is a multiprocessor.

Almost all modern desktop and mobile systems are uniprocessors.