Born in Westminster, Greater London, Griffiths started his career playing for Basildon-based team Beech United in 1998, before signing for Southend United's youth system in 1999. He left in 2001 and joined the football academy at Thurrock and Basildon College, where he played for one year. Whilst playing for the academy team, they won their league and two cup competitions. He was also capped for Essex county football team, and missed out on a place in the England Under-19 team when he was injured before the final trial. After college, aged 17, he signed for Isthmian League Division One North club Aveley.
Dagenham & Redbridge
On 11 August 2004, Griffiths signed for Conference National club Dagenham & Redbridge on a three-year contract. He made his debut as a 90th-minute substitute in a 4–1 away win over Forest Green Rovers on 17 August 2004. He was played at left back, and went on to make 18 league appearances in 2004–05. In 2006–07, Dagenham & Redbridge gained promotion to League Two as Conference champions, with Griffiths playing in 45 of the club's 46 league matches. He continued to feature regularly following Dagenham's promotion, playing in 41 and 44 league matches during 2007–08 and 2008–09 respectively. He made 15 appearances for Dagenham during 2009–10, before signing on loan for Championship club Peterborough United on 23 October 2009, with a view to a permanent move.
Peterborough United
Griffiths signed a permanent three-and-a-half-year deal with Peterborough United on 22 January 2010. He played in 20 league matches, as Peterborough were relegated to League One at the end of the season. Griffiths was not seen to have future in the squad by new manager Gary Johnson, who loaned him to Chesterfield at the beginning of 2010–11, on an initial month-long loan deal. He later had his loan extended for a further two months until 6 November 2010. After making 19 appearances for the club, Griffiths rejoined Chesterfield until the end of the season. Griffiths made a total of 33 appearances for Chesterfield during the season, helping them to win the League Two title. Griffiths' next two seasons were characterised by short-term loan deals, as he failed to make another appearance for Peterborough. He joined League Two club Crawley Town on a one-month loan in September 2011, making six appearances. Griffiths returned to Chesterfield on 25 November 2011, signing a loan deal until 2 January 2012, playing in four matches. He then joined League Two club Rotherham United on loan on 10 January 2012 for the remainder of 2011–12, making eight appearances. He featured in a behind closed doors game for Forest Green Rovers in September 2012 against Bournemouth, and later joined Plymouth Argyle in League Two on loan for one month. Having returned to Peterborough in November 2012, Griffiths left the club at the end of January 2013 after his contract was cancelled six months early by mutual consent.
Luton Town
Griffiths signed for Conference Premier club Luton Town on 25 March 2013, linking back up with his former Dagenham & Redbridge manager John Still. He signed a short-term contract until the end of 2012–13. After impressing in the six matches he played for the club, Luton tied Griffiths to a one-year contract extension. He played in every league game of Luton's successful 2013–14 season as the club were crowned Conference Premier champions, with Griffiths a part of the defence that kept a club-record 23 clean sheets. Griffiths played enough matches throughout the season to trigger an extension clause in his contract, keeping him at Luton until June 2015. He played in 35 league matches throughout 2014–15, earning a further year's extension to his contract in the process. Griffiths made 24 appearances in all competitions under the management of John Still and caretaker manager Andy Awford in 2015–16, before the appointment of Nathan Jones as the new Luton manager on 6 January 2016. On 30 January 2016, Griffiths joined National League club Woking on a 28-day loan. On the same day, Griffiths made his Woking debut in a 2–2 draw with Barrow, in which he scored an own goal to give Barrow a 1–0 lead. He made four appearances for the club in all competitions. On 10 May 2016, it was announced that Griffiths would not have his contract renewed. He left the club upon the expiry of his contract.
International career
Griffiths' performances for Dagenham & Redbridge led to him being called up by the England National Game XI team. He played against the Netherlands in the last of England's 2005–06 European Challenge Trophy group matches on 29 November 2006, which saw them finish top of their group with maximum points. He also played in the 3–1 away defeat to Northern Ireland on 14 February 2007.
