The Scion xD is a five-door hatchback subcompact marketed in the US by Japanese automaker Toyota beginning with the 2008 model year - replacing the xA. The Scion xD and the second generation xB were first shown to the public on February 8, 2007 at the Chicago Auto Show. The xD appeared in Scion showrooms in northern hemisphere summer of 2007.

The xD is a second-generation Toyota ist; the first was marketed in the U.S. as a Scion xA. It is essentially a mildly elongated five-door Toyota Vitz. The Vitz is a three-door marketed in the U.S. as the Yaris. Thus, the five-door Yaris was not offered in the U.S. market when the three-door and sedan were launched; however, as of 2009, the five-door Vitz will be offered in the US as the Yaris. The xD features the same sliding and reclining rear seat that is optional on the Yaris three-door. Unlike the Yaris and xA/first generation Ist, the xD's instrument gauges are located behind the steering wheel (as opposed to being centered atop the dashboard). As opposed to the Yaris and xA, the xD's speedometer and tachometer are on the same dial counter-rotating.