X series

X series or xSeries or Series-X or variation, may refer to:


 * BMW X-series vehicles, see List of BMW vehicles
 * Fujifilm X series, a series of digital cameras
 * IBM/Lenovo X series
 * IBM System x, previously eServer xSeries
 * ThinkPad X series, a series of laptops
 * Intel Core X-Series, a series of computer CPUs, under the Core brand from Intel
 * Nokia Xseries, a family of mobile phones.
 * Northgate SeriesX, a line of computers from Northgate Information Solutions
 * Sony X series
 * Sony Ericsson X series, a series of cell phones
 * Sony Vaio X series, a series of laptops
 * X (video game series), a space combat and trading game series
 * X the album, a series of Christian rock compilation albums
 * X-Men (film series) (2000-2020, FOX), frequently called the "X" films, both X2 and X3 being so named
 * X-planes, a series of US experimental aircraft
 * Xbox Series X, 9th generation videogame console from Microsoft
 * Yamaha's X-series motorcycles