Dwayne Anthony Mattis (born 31 July 1981) is a former professional footballer who played as a midfielder.
Released at the season's end, Mattis joined Bury and made his debut on 7 August 2004 in the 3–1 home win over Yeovil Town.
In September 2007 he signed for Walsall on a month-long loan deal but suffered a broken leg in a 0–0 draw with Tranmere Rovers and was sent back to Barnsley where he is expected to be out for three months.
On 3 July 2008, he signed a permanent contract with Walsall returning to the club he had a successful loan spell with during the previous season.
Following an injury and subsequent operation, appearances in the first team were limited and in January 2012, his contract was cancelled by mutual consent.