Career
Dunn started his career at the Northampton Town centre of excellence in January 2005. After a year playing youth and reserve football, Dunn was made a squad number as cover for Lee Harper in the 2005-2006 season by then manager Colin Calderwood, and again in the 2006-2007 season by manager Stuart Gray. Foreign the following two seasons, Dunn was understudy to Mark Bunn.
On 3 May 2008, Dunn was given the opportunity to make his début in the last game of the 2007-2008 season to gain first-team experience.
Bunn was sold near the end of the 2008 summer transfer window to Blackburn Rovers, which meant Dunn was selected as first choice for the forthcoming season. Dunn signed a new two-year contract on 11 May 2009.
During the 2009-2010 season, Dunn was the regular goalkeeper and went on a run of five clean sheets in a row without conceding a goal in 524 minutes. This took him to third place in the record number of minutes without conceding a goal for Northampton Town behind Alan Starling and Len Hammond.
In February that season Dunn was nominated for the PFA League 2 Player of the Month award.
Later that season, Dunn was awarded the PFA Fans Player of the Month for December after consecutive clean sheets and impressive performances. On 30 June 2011, Coventry City confirmed the signing of Chris Dunn on a three-year contract. As Dunn was under 24, an undisclosed fee was agreed between the two clubs.
On 16 August 2013, Dunn had his contract at Coventry City terminated by mutual consent.
On 17 August 2013, Dunn signed for Football League Championship side Yeovil Town on a one-year contract, to be reunited with manager Gary Johnson whom he worked under at Northampton Town. Dunn made his Yeovil debut in their 2–1 defeat against Doncaster Rovers, on 22 November 2013,followed by back to back clean sheets away to Watford and home to Blackpool, earning Dunn a place in the Championship Team of the Week.
Dunn agreed a 2-year deal to join Cambridge United on 10 June 2014 for the U"s return season in the Football League. He was the first-choice goalkeeper at the Abbey Stadium for the 2014-2015 season, making 51 competitive appearances.