The Nikon D1 is a digital single-lens reflex camera (DSLR) that was made by Nikon Corporation introduced on June 15, 1999. It features a 2.7-megapixel image sensor, 4.5-frames-per-second continuous shooting, and accepts the full range of Nikon F-mount lenses. The camera body strongly resembles the F5 and has the same general layout of controls, allowing users of Nikon film SLR cameras to quickly become proficient in using the camera. Autofocus speed on the D1 series bodies is extremely fast, even with "screw-driven" AF lenses.

A digital single-lens reflex camera is a digital camera that combines the optics and mechanisms of a single-lens reflex camera with a solid-state image sensor and digitally records the images from the sensor.