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- Chris Kanyon American professional wrestler.
- Kerry Katona, English television presenter, writer, magazine columnist and former pop singer with girl band Atomic Kitten. BBC.
- Rep. Patrick J. Kennedy has been open about mental health issues, including being diagnosed with bipolar disorder.
- Otto Klemperer, conductor.
- Margot Kidder, actress — self-described.
- Patrick Kroupa, writer and hacker, has been very open about his drug use and mental health issues, after his last heroin detox in 1999. He mentions bipolar disorder openly in several interviews.
Read more about this topic: List Of People With Bipolar Disorder