T. Posthlewaite is the professional name used by Canadian actor Todd Postlethwaite for some of his voice acting work in anime and animated productions. He was born in Garden Bay, British Columbia, Canada, in January 1960. His career includes both on-camera and voice acting roles, with his voice work primarily associated with English-language dubs of Japanese anime.

In anime voice acting, Posthlewaite is credited under the variant name T. Posthlewaite. He provided voices for the English adaptation of the 2004 anime film Appleseed. He also had a notable role in the 2006 anime television series Kiba, where he is credited as T. Postlewaite for voicing the characters Moloch and Genm.

One of his prominent credits in animation is for the anthology project Halo Legends, released in 2010. In this collection of short films set in the Halo universe, T. Posthlewaite is listed as a member of the English voice cast, contributing to the project which featured the work of several prominent Japanese anime directors.