Silvan Dominic Widmer (born 5 March 1993) is a Swiss professional footballer who plays as a right-back for Bundesliga club Mainz 05, whom he captains, and the Switzerland national team.

He made his debut for the Swiss senior team as a 59th-minute substitute for Stephan Lichtsteiner in a UEFA Euro 2016 qualifier against San Marino on 12 October 2014.

[13][14] Widmer played in seven of Switzerland's eight 2022 FIFA World Cup qualification matches, scoring in the team's 1–1 draw with Italy on 14 November 2021.

[15] At the 2022 FIFA World Cup finals in Qatar, Widmer started all three of Switzerland's Group G matches, but was unavailable for the team's 6–1 loss to Portugal in the round of 16 due to illness.

[16] Widmer started all three of Switzerland's UEFA Euro 2024 Group A matches at right wing-back and was yellow carded in both the 3–1 win against Hungary and the 1–1 draw with Germany.