The Merseyside Skeptics Society (MSS) is a nonprofit organisation that promotes scientific scepticism in Merseyside and the United Kingdom. Founded in 2009, the society has campaigned against the use of homeopathy, challenged the claims of psychics, and hosts regular events in Liverpool, podcasts, and an annual conference in Manchester, QED: Question. Explore. Discover.

Scientific skepticism or rational skepticism, sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence. In practice, the term most commonly refers to the examination of claims and theories that appear to be beyond mainstream science, rather than the routine discussions and challenges among scientists. Scientific skepticism differs from philosophical skepticism, which questions humans' ability to claim any knowledge about the nature of the world and how they perceive it, and the similar but distinct methodological skepticism, which is a systematic process of being skeptical about the truth of one's beliefs.