Sparky Thornton is an alternative professional name used by American voice actor Kirk Thornton, primarily in English-language dubs of anime during the 1990s and early 2000s. Under this alias, he built a substantial career as a voice actor, ADR director, and script writer, contributing to numerous series and films.

Thornton's early anime voice work, often credited under the name Sparky Thornton, includes significant roles in prominent titles. He voiced Anavel Gato in the 1998 English adaptation of Mobile Suit Gundam 0083: Stardust Memory and provided voices for the 1999 English dub of Perfect Blue, both under this alias. He was also credited as Sparky Thornton for his role as Hajime Saito in the 2001 English dub of Rurouni Kenshin. During this period, he took on the role of Ken Sanada in the series Dual! Parallel Trouble Adventure and the role of Ken Edmundo in Heat Guy J.

Throughout his career, which has seen him use other aliases such as Ron Allen, Thornton has frequently collaborated with other voice actors and directors in the industry. His extensive filmography includes major roles in long-running franchises; he is known for voicing Gabumon across various iterations of the Digimon series, Jin in Samurai Champloo, Don Patch in Bobobo-bo Bo-bobo, and Klein in Sword Art Online. In addition to anime, he has voiced characters in numerous video games, notably Shadow the Hedgehog and Orbot in the Sonic the Hedgehog series and Saïx in the Kingdom Hearts series. Beyond acting, he has also contributed significantly as an ADR director and script writer, co-directing episodes of the long-running series Bleach. Thornton's work under the Sparky Thornton alias represents a foundational period in a long and prolific career in voice acting.