Mitja Viler (born 1 September 1986) is a retired Slovenian footballer who played as a left-back.

He spent his entire career in his homeland Slovenia, making over 400 appearances in the Slovenian top division with Koper and Maribor.

[1] Before moving to Maribor in 2010, he played for Koper and made a total of 142 appearances for the club in the Slovenian first division, 1.

On 21 October 2014, Viler scored an own goal in a 6–0 UEFA Champions League loss to Chelsea, and was substituted minutes later.

[4] On 22 August 2017, Viler scored the only goal for Maribor against Hapoel Be'er Sheva in the second leg of the play-off round of the 2017–18 UEFA Champions League, helping his team to qualify for the group stage of the competition for the third time in history.