Marek Viedenský (born 18 August 1990) is a Slovak professional ice hockey forward.

[3] On 2 August 2013, the San Jose Sharks of the National Hockey League re-signed Viedenský to a one-year contract.

[4][5] After three year within the San Jose Sharks organization, Viedensky left as a restricted free agent to sign a one-year contract with Finnish Liiga club, HPK on 16 June 2014.

[6] As a member of Team Slovakia, Viedenský competed at the 2009 and 2010 World Junior Ice Hockey Championships.

His brother, Matúš Viedenský (born February 12, 1992), is also a Slovak ice hockey player.