「音速小子 X」（英文：Sonic X　日文：ソニック エックス）是一部由日本 东京电视台和TMS Entertainment制作的动画，改编自著名电玩音速小子，总共三季，每季26集，第三季未在日本放映，却有日文配音。日本于2003年4月6日至2004年3月28日于东京电视台播放第一季和第二季，而第三季始终未播放。香港在2005年1月3日至3月17日于无线电视翡翠台首播第一季与第二季（1~52集），其后在2005年10月5日至11月14日播放第三季（53~78集）。台湾的第一季到第三季都在东森幼幼台播映。

Sonic X(Japanese:ソニックX,Hepburn:Sonikku Ekkusu) is a Japanese anime television series created by TMS Entertainment and based on the Sonic the Hedgehog video game series published by Sega. Sonic X initially ran for fifty-two episodes, which were broadcast on TV Tokyo from April 6, 2003, to March 28, 2004; a further twenty-six were aired in non-Japanese regions such as the United States, Europe, and the Middle East from 2005 to 2006. The show's American localization and broadcasting were handled by 4Kids Entertainment—which heavily edited the content and created new music—until 2012, when Saban Brands obtained the rights to the series, and later in 2015 by Discotek Media. It is the fourth cartoon of Sonic the Hedgehog following Sonic Underground and preceding Sonic Boom.