Rix, who had been terminally ill, died today morning, confirmed a spokesperson for the learning disability charity Menap, which the headed as the president, reported Daily Telegraph.
At the beginning of the month, Rix made a heartfelt plea for euthanasia to be legalised in order to allow him to "slip away peacefully" as he revealed he was suffering with a terminal condition.
The actor earlier voted against an Assisted Dying Bill, which came before the House of Lords in 2006 because he feared that people with learning disabilities might become the unwilling victims of euthanasia.
Rix was considered one of the country's foremost campaigners for people with learning disabilities.
He was one of Britain's most popular TV and stage actors with his own brand of "Whitehall farce" comedy. He also featured in films like "Reluctant Heroes" (1951), "Dry Rot" (1956), "Don't Just Lie There, Say Something!" (1973)
He later became a leading campaigner for people with learning disabilities after his daughter was born with Down's syndrome.