The Walkman X series is a portable music player designed and released by Sony in Japan in 2009.

A limited version of the Walkman X series was released only in Japan, with a slightly different design and a higher price.

A soft key that at the bottom of all music screens allows selection of various sub-menus, including a folder browser option.

It also features some proprietary Sony technologies including DSEE (to predict and restore high frequencies lost during audio compression), Clear Bass (to enhance bass levels while minimizing distortion at high volume) and Clear Stereo (to provide improved channel separation with open type headphones).

The Walkman X's notable market rivals at the time of launch were iPod Touch, Cowon S9 and Samsung P3.