John Hasler (born 21 April 1974) is an English actor and voice actor, who is best known as T-shirt in the children's television series T-Bag from 1985–92.
Hasler was the only character to remain with the show for its entire television run, starting as a young boy and leaving as a teenager, he's also known for voicing Thomas the Tank Engine in the UK dub of the children's television series Thomas & Friends.