Mitterberg-Sankt Martin is a municipality since 2015 in the Expositur Gröbming in the Liezen District of Styria, Austria (judicial district Schladming).

The municipality was founded as part of the Styria municipal structural reform,[3] at the end of 2014, by merging the former towns Mitterberg and Sankt Martin am Grimming.

Because of the merger, both crests lost their official validity on January 1, 2015.

The authorization of the municipal coat of arms for the merged community took effect on 15 February 2015.

[7] Blazon (crest description): The municipality formed, together with Michaelerberg-Pruggern and Gröbming, the tourism agency "Gröbminger Land“.