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- Mackenzie Taylor, British comedian.
- Michael Thalbourne, Australian psychologist and parapsychologist.
- Steven Thomas, American entrepreneur.
- Gene Tierney, Academy Award nominated actress, Best Actress (1945).
- Devin Townsend, musician, Strapping Young Lad, The Devin Townsend Band. He took himself off of his medication to write lyrics for Strapping Young Lad's album Alien.
- Nick Traina, singer, "in the last year of his life, he began telling people he was manic-depressive."
- Timothy Treadwell, American environmentalist and bear enthusiast, featured in the 2005 documentary film by Werner Herzog titled Grizzly Man.
- Margaret Trudeau, Canadian celebrity and ex-wife of former Canadian Prime Minister Pierre Elliot Trudeau (deceased). She now travels Canada and other countries speaking out against the stigmas on mental illness.
- Ted Turner, American media businessman.
Read more about this topic: List Of People With Bipolar Disorder