Nicholas Mark Harding (born 1964 in London) is an author and British screenwriter who has written for film, television, magazines, newspapers and computer games. He is also a published poet and short story writer. He is the author of the cult classic and critically acclaimed How to Start Your Own Secret Society. He has appeared on ITV’s This Morning, has been a contributor to TV documentaries on secret societies including one for Channel 4 and has made over fifty appearances for both local and national BBC radio. He co-wrote The Notebooks of Cornelius Crow, shown in Cannes in 2004, and Folie a Deux, premièred at the Maine International Film Festival in 2012, with director Sean Martin. He is active in the Mendip Caving scene and was a co-discoverer of the Lost Cave of Loxton made famous by Alexander Catcott, Axbridge Hill Cavern and Upper Canada Cave in Hutton near Weston super Mare. He is a member of the Axbridge Caving Group. He is an atheist, skeptic and a registered Bright. He was one of the interviewees on BBC Radio 4's Weston's New Pier presented by Chris Ledgard. His novel Sunsphere, a tongue in cheek historical conspiracy, was published in 2011. He was co-writer of The Way Out, winner of a 2020 Royal Television Society award, starring Omid Jalili and Blaithin Mac Gabhann, directed by Suri Krishnamma, for BBC4, The Arts Council and Battersea Arts Centre. He is currently developing film and television projects and is represented by Olav Wyper at SMA Talent in London.