Fox was born in Winsford, Cheshire and learnt his trade at his boyhood club Everton's youth system at thirteen from Liverpool. As Fox progressed through the academy, Fox was offered a full time contract with the club, in which he signed on 19 May 2004.
After signing a full time contract with the club, Fox continued to develop in the reserve team and soon came to a first team appearance was as an 18-year-old being named on the bench for Everton's home match against Aston Villa in October 2004.
On 2 February 2005, Fox was loaned out by Everton to Stranraer, where he played 11 games (scoring once against Berwick Rangers) and helped them secure promotion to the Scottish First Division before his eventual release from Everton in the summer of 2005. Seven years on, Fox revealed that his time at Stranraer considerably helped with his career development: “It was a great grounding for me and made me realise I had to take every opportunity to make sure I played at the highest level possible."
After leaving Everton, Walsall moved quickly to sign Fox, alongside Everton youth teammate Anthony Gerrard on 3 June 2005.
Fox made his debut for the club against Rotherham United in the opening game of the season, making first start. In the next game against Southend United, Fox provided an assist for Matty Fryatt to score the club’s first goal in the match, as they drew 2–2 and was named Man of the Match by Birmingham Mail. Fox’s performance throughout August earned him Evening Mail Saddlers Player of the Month and since making his debut, Fox quickly becoming a regular in the first team. Despite the injuries and suspension, Fox finished his first season at Walsall, making 33 appearances. Fox later reflected the 2005–06 season, in which he stated the poor season made him "more mature as a player and a person".
In the 2006–07 season, Fox started the season well when he scored his first goal for the club in a 5–0 win against Peterborough United on 12 September 2006 and then scored his second goal of the season, two weeks later on 23 September 2006, in a 2–1 win over Bristol Rovers. Fox then scored his third goal against Peterborough United on 1 January 2007, for the second time this season, in a 2–0 win. Despite missing two matches in the 2006–07 season, due to injury and suspension., Fox ended of the season with 44 appearances and three goals, as he helped the club promoted to League One.
In the 2007–08 season saw Fox continued to make an impression at Walsall when he scored his first goal of the season against Gillingham on 1 September 2007. Two weeks later, on 15 September 2007, Fox scored again, in a 2–1 win over Millwall. Fox scored again three weeks later on 2 October 2007, in a 3–2 win over Doncaster Rovers. However, on 26 December 2007, Fox received the first red card of his career in a 1–1 draw against Port Vale after a second bookable offence. In the January transfer window, Fox’s future was in doubt after attracted interests from clubs, including Leeds United.
During his time at Walsall, Fox made over 100 appearances and scoring six times in all competitions, as well as, having a positive attitude.
On 28 January 2008, Fox joined Coventry City in a double transfer deal (with his defensive partner Scott Dann also moving to the Ricoh Arena only 72 hours later), after agreeing personal terms and a passing a medical. Before this, Colchester United had agreed a fee with Walsall for Fox.
Just days after signing for Coventry City, Fox made his debut for the club in a 1–0 defeat against Hull City. Two months after making his debut, Fox scored his first goal in a 5–1 win over Colchester United. In the next game against Wolverhampton Wanderers on 26 April 2008, Fox provided an assist for Elliott Ward, in a 1–1 draw. As the 2007–08 season progressed, in which Fox made eighteen appearance and scoring once, Fox immediately made an impact in the first team.
Ahead of the 2008–09 season, Fox attracted interests from Premier League clubs, though Ray Ranson made it clear that Fox and Dann were not for sale. Despite this, Fox remained in the first team in his first full season at the club. Fox scored his first goal of the season, in a 1–1 draw against Swansea City on 25 November 2008 and scored in the next game on 1 December 2008, in a 3–1 loss against Reading. After serving a suspension for one match, Fox scored on his return in the next game, in a 1–1 draw against Charlton Athletic on 9 December 2008. After an injury struck him in late–December, Fox scored on his return on 10 January 2009, in a 1–1 draw against Queens Park Rangers. Fox scored his sixth goal of the season on 28 February 2009, in a 2–1 win over Norwich City, in which he stated afterwards that it was his best goal ever. Despite suffering from an injury once again in March and being sent–off, in a 3–2 win over Watford on 25 April 2009, Fox, alongside his team–mate Kieren Westwood, were named in the Championship PFA Team of the Year for 2009 in his debut season at the club, as well as, winning the Players’ Player of the Year award for the 2008–09 season. In the 2008–09 season, Fox finished the season, scoring six times in forty–five appearance in all competitions. The 2008–09 season was also a turning for Fox, as he began to taking free–kicks, in which went in four of the five times.
With the club keen on extending his contract, Fox, himself, stated he wanted to stay at the club. However, Fox continued to attract interests from Premier League clubs, such as, Blackburn Rovers, Aston Villa and Newcastle United. Fox later credited Coventry City for helping him turn his life around.
On 24 July 2009, Fox signed for Celtic for an undisclosed fee (believed to be £1.5 million) Coventry's manager, Chris Coleman expressed his disappointment at losing Fox: "I was determined not to lose . . . Danny Fox and so were the club, but it is hard once players are offered a lot of money to go to big, big clubs."
Fox made his competitive debut for Celtic in the UEFA Champions League qualifiers against Dynamo Moscow. He became a regular free kick taker for Celtic, but did not score a goal, although he did provide assists in games against St Johnstone and Dundee United. Fox made his last appearance for Celtic in an Old Firm derby against Rangers in a 1–1 draw, where he played 90 minutes.
On 29 January 2010, after just six months in Glasgow, Fox joined Premier League club Burnley on a three and a half-year contract for an undisclosed fee, believed to be £1.8 million.
On his debut for Burnley, Fox claimed an assist and the winning goal against West Ham United on 6 February in a 2–1 home win. Fox afterwards claimed that his debut with Burnley was "his best day in football". His efforts lifted Burnley above West Ham and out of the relegation zone. Despite this, Burnley went on to be relegated to the Championship. Fox went on to make fourteen appearance for the club.
Following their relegation, Fox continued to remain as a first team regular at Burnley and went on to provide seven assists during the 2010–11 season. However, his 35 appearance for the club was restricted, due to suspension and injury. Fox made his only appearance of the 2011–12 season, playing in the opening game of the season, in a 2–2 draw against Watford.
On 11 August 2011, Fox signed for Southampton on a four-year deal for an undisclosed fee. It was later revealed Fox’s move to Southampton was Burnley’s board of directors decision to sell him, citing an offer “could not refuse”.
On 16 August 2011, he made his debut coming off from the bench replacing David Connolly in a 5–2 away win over Ipswich Town. Fox then provided a hat–trick assists, in a 4–0 win over Derby County on 18 February 2012. At Southampton, Fox began to established himself in the first team, playing in the left back position and helped the team gain promotion to the Premier League.
In the 2012–13 season, Fox continued to be in the first team regular and scored his first goal for the club in a 6–1 defeat at Arsenal on 15 September 2012. However, Fox’s own injury concern and his sending off against West Brom on 27 April 2013, which saw him served them a three–match ban, restricted him to twenty appearance in the 2012–13 season.
Fox made his first appearance of the 2013–14 season, playing in the left–back position, in a 5–1 win over Barnsley in the second round of League Cup. However, Fox found himself competing over a left–back position with Luke Shaw. Fox found himself in the sidelined when he suffered a hamstring injury that kept him out for weeks. Fox made his return to the first team on 22 December 2013, where he set up one of the goals, in a 3–2 loss against Tottenham Hotspur.
On 30 January 2014, Fox signed on loan for Championship side Nottingham Forest until the end of the 2013–14 season.
Fox made his Nottingham Forest debut on 2 February 2014, where he played 62 minutes before being substituted, in a 3–1 win over Yeovil Town. After making his debut, Fox expressed delight to make his Nottingham Forest debut, though he stated the game was tough. A week later on 11 February 2014 against Huddersfield Town, Fox provided an assist for Jamie Paterson, who scored twice, in a 3–0 win. However, personal reason and injury, which he sustained in a match against Birmingham City on 19 April 2014, restricted him to 14 appearance.
On 9 May, Nottingham Forest signed Danny Fox on a three-year deal. Ahead of the 2014–15 season, Fox continued to wear number 13 shirt, as he previously did whilst on loan. Fox captained Nottingham Forest for the first time in the first round of Football League Cup and played 90 minutes, in a 1–0 win over Tranmere Rovers. However, Fox's performance later came criticism from Nottingham Forest supporters in a 1–0 loss against Rochdale that saw Nottingham Forest were eliminated in the FA Cup. After missing three matches because of this, Fox's return saw an improvement when he set up a goal, in a 3–0 win over Wigan Athletic and in the next game, in a 4–4 against Blackpool. Fox then provided three assists in two matches, which he provided twice against Reading and once against Charlton Athletic. Despite his own injury concern and losing his first team place to Michael Mancienne in the left-back position, Fox made 27 appearance in his first full season at Nottingham Forest.
In the 2015–16 season saw Fox continued to compete with Mancienne over the left-back position, as newly Manager Dougie Freedman remained in his first team plan. Fox made his first start of the 2015–16 season, playing as a left-back, in the opening game of the season, in a 1–0 loss against Brighton & Hove Albion. However, Fox's first team place was soon dispatched and was demoted to the substitute bench as a result. After almost two months since being in the first team, Fox made his return, where he played in a right-back position and 90 minutes, in a 2–0 loss against Bristol City. Fox was told by Freedman that he would no longer be part of his first team plan and he was allowed to leave the club, but this never happened and stayed at Nottingham Forest. While on the sidelined rom the first team, Fox was sent to the training in the club's reserve. After five months absence from the first team, Fox was recalled to the first team by newly caretaker Manager Paul Williams in March and made his first appearance in five months, in a 2–1 loss against Reading on 5 April 2016. Fox remained in the first team for last seven games, as the season progressed until he received a straight red card, in the last game of the season, in a 2–1 win over already relegated side MK Dons. Fox later finished the 2015–16 season, making ten appearance.
Ahead of the 2016–17 season, Fox signed a one-year contract extension with the club on 25 July 2016. Because of his red card against MK Dons on the last game of the season, Fox had to serve a three match ban. Fox made his return from suspension from the first team, where he made his first start and played 90 minutes, in a 1–0 loss against Brentford on 16 August 2016.
Fox, alongside Dann, was called up to the England under-21 squad for the match against Poland on 25 March 2008 and was selected in the starting 11. Fox and Dann were once again called–up for the England U21 squad in May 2008, but didn’t play, due to injury. In early 2009, Fox was called–up by England U21 for the third running, but didn’t play, due to the similar circumstances he had before.
He declared himself available to play for Scotland through his grandfather. Fox was selected for Scotland's friendly against Japan in October 2009, but had to withdraw due to an injury sustained while playing for Celtic. Fox finally made his debut for Scotland in a 3–0 defeat to Wales in November 2009. He did not feature for Scotland again until August 2012, when he was recalled by Craig Levein for a friendly against Australia. He played 69 minutes and was involved in two goals scored by Scotland in a 3–1 victory. He also played in Scotland's loss against Wales on 12 October 2012 at left back.As of 7 May 2017
Outside of football, Fox likes to relax by watching films, with comedies and thrillers are his film genre preference. His parents resided in Cheshire and has a younger brother, who is in the RAF, and a sister.
In December 2014, Fox dyed his beard yellow in effort to raise money for charity called Cystic Fibrosis Foundation following his friend's death, who suffered from Cystic Fibrosis. Because of this, Fox was appointed as the ambassadorial role for the Cystic Fibrosis charity.Walsall
League Two champions: 2006–07
Football League Championship runners-up: 2011–12
Stranraer Young Player of the Year: 2004
Coventry City Players' Player of the Year: 2009
Championship Team of the Year: 2009