Niall Martin Keown (born 5 April 1995) is a professional footballer, who plays for Reading and the Republic of Ireland U21 as a defender. He is the son of former Arsenal and England international Martin Keown. Keown joined the Royals Academy in 2011.
Keown made his debut, for Reading in their 2–1 Championship victory over Brighton & Hove Albion on 10 March 2015, coming on as a 92nd substitute for Danny Williams.
Keown signed a new three-year contract with Reading on 14 July 2015.
In March 2015, Keown was called up to the Republic of Ireland U21 squad, having previously been a back up for the England U18's.