Jonas Armstrong (born 1 January 1981 in Dublin) is an Irish born British actor, raised in Lytham St Annes, Lancashire best known for his appearances on television in the United Kingdom, where he has played the title role in the BBC One drama series Robin Hood.

Jonas Armstrong was born in Mount Carmel Hospital, Dublin, Ireland on 1st January 1981, exactly one minute after midnight on New Years Day. He was reported to be the first baby born that year. His parents moved to St Annes, Lancashire, when Jonas was six years old. He is the eldest of three children and has two siblings - a brother and sister, both younger. Both are rumoured to be planning on following in their big brothers footsteps. Jonas claims to be a typical Capricorn and he jokes that his friends have nicknamed him 'monas' on account of his fondness for complaining. Jonas is 6ft tall with brown hair and blue eyes.

Jonas attended Arnold School in Blackpool, and was a member of the highly acclaimed drama group In Yer Space, appearing in various plays including Not About Heroes and A View From The Bridge, at festivals around the UK including the Edinburgh Fringe. In 2000 Jonas won a place at the Royal Academy of Dramatic Art.