Kath Gillespie Sells was a psychotherapist, writer, disability rights campaigner and LGBT+ rights campaigner from the United Kingdom. In 1990, she founded REGARD, a national, volunteer-run organisation of disabled lesbians, gay men, bisexuals and transgender people. Regard adheres to the social model of disability. Sells was instrumental in there being a Disabled people’s element included the London Pride parade. In 2011 she served as the parade’s Grand Marshall.

Sells was a ward sister at Barnet General Hospital when she became disabled as a result of a splinter in her finger, which led to septicaemia, a multi-day coma and the loss of the finger. This led to spinal thecal arachnoiditis that put her in a wheelchair. She re-trained as a teacher. Sells was Joint Head of Training with Jane Campbell at Disability Resource Team in Camden and co-authored The Sexual Politics of Disability with Tom Shakespeare and Dominic Davies in 1996