The charity aims to use football to promote tolerance in society via a range of sporting, educational and social inclusion activities.
Football for Peace was founded by former Chile international Elias Figueroa in South America back in 2006 and Mostyn says that he is very passionate about the cause.
"This is something I am proud to be doing not only for myself built also by representing AFC Bournemouth as well," Mostyn explained in an interview with 'Sky Sports News'.
"I literally just fell in love with the organisation. It's something I am really passionate about. And the whole raison d'etre of AFC Bournemouth is about communities, it's about families and it's about passion - and certainly I haven't met anybody in a long, long time that has more passion than Kash [Siddqi, co-founder of the international arm of Football for Peace].
"It's hugely influential [when football's most recognisable names sign up to causes like this].
"That's really why I got involved, and I'm going to try and use my influence as a Premier League chairman also my role as an FA Council member as well to spread the word.
"There are so many multilingual players, managers, coaches and board members in football now but I only speak two languages, I speak English and fluent football.
"And I think fluent football is the No 1 language in the world. Wherever you go people can communicate with you, and you can, through football, make a difference."