Starring Billy Bragg, Diana Evans, Michael Rosen, Evie Wyld, Mark Haddon, Alex Wheatle, Zing Tsjeng and Dean Atta, the film also includes recent graduates from First Story's Writers-in-Residence schools programme, Safeerah Mughal and Imaru Lewis.
Author and songwriter Billy Bragg says: "As someone who was told their only options were to either join the armed forces or work in a factory, I feel very fortunate to make a living out of creativity.
"My writing was encouraged from a very early age so I think National Writing Day is a great project and I'm very happy to support it."
National Writing Day is an annual nationwide celebration of creative writing and takes place this year on Wednesday June 27th.
It encourages groups and individuals of all ages, genders and backgrounds to pick up a pen and try their hand at writing.
The idea for the project is simple: everyone has a story to tell and writing can be a source of pleasure and power.
As Mónica Parle, Executive Director of First Story, explains: "Many people struggle with writing, yet story-telling is such an integral part of being human.
"National Writing Day recognises that everyone has a unique story to tell and that only they can tell that story.
"We're delighted to have the support of so many leading writers in the video for National Writing Day to help us spread that message."