Matz Willy Els Sels (born 26 February 1992) is a Belgian professional footballer who plays as a goalkeeper for Ligue 1 club Strasbourg.
Sels started his youth career at Kontich, but transferred to Lierse at the age of seven. Over there, he started in 2010 in the first team. After the departure of Eiji Kawashima to Standard Liège in the summer of 2012, Sels became the first choice keeper. In his first game in the First Division, on 29 July 2012 against Gent, he saved a penalty. At the start of the 2013–2014 season, when he refused to sign a new contract, he was demoted to the second team.
On 31 December 2013, it was announced that Sels would complete a transfer to KAA Gent once the transfer window opened. He would become the number one goalkeeper as Frank Boeckx's contract was due to expire at the end of the season. Sels made his debut for AA Gent on 14 January 2014 against K.V. Kortrijk, in the quarter finals of the Belgian Cup. He helped AA Gent qualify for the next round after penalties; with the game ending 1–1 on aggregate.