Dean John Hammond is an English football player who plays for Southampton in the Championship. He previously played in the Football League for Brighton & Hove Albion, Leyton Orient and Colchester United.

During the early stages of his career at Brighton, Dean had loan spells at lower league teams twice in 2003, first to Aldershot during September, and secondly to Leyton Orient in October. He was given a six-month ultimatum at the start of the 2004–05 season by then manager Mark McGhee, Hammond impressed and was awarded a new deal that summer.

At the beginning of the 2005–06 season he was handed the vacant number 11 shirt at the club, and became a first-team regular, either playing on the left hand side of midfield or in his preferred natural position of central midfield. In the 2006–07 season he was handed the captain's armband at the club after injuries to both Richard Carpenter and Charlie Oatway. At the end of January 2007, Carpenter was released by Brighton, so Hammond became the new official club captain.

At the start of the 2007–08 season, Hammond had one-year remaining on his contact at the Withdean, manager Dean Wilkins was keen to offer Hammond a new deal, with the club and representatives for the player beginning talks in October 2007. During January 2008, it was revealed that Hammond would only sign a new deal for the club if they showed the ambition of returning to the Championship. When the £300,000 capture of striker Glenn Murray from Rochdale failed to change Hammond's mind, the club placed him on the transfer list with little more than a week of the transfer window remaining. On 30 January, Brighton accepted an offer of £250,000 plus add-ons for the player. Hammond completed the deal the following day, moving to Colchester United.

On 19 August 2009, Hammond signed a 3 year contract with Southampton for an undisclosed fee. He scored his first goal against Oldham Athletic, and made the scoresheet again a week later, against MK Dons. On the 5th March 2011, he scored the second goal with a drive from the edge of the area against former club Colchester United to complete a 2-0 away win, and 1 week later scored an important second goal against AFC Bournemouth in a 3-1 away win.