Mustla is a small borough (alevik) in Viljandi Parish, Viljandi County, Estonia.

As of the 2011 census, the settlement's population was 818.

In June 2018, a plaque commemorating Alfons Rebane was unveiled on the wall of a private building in Mustla where he had lived.

[2][3] The Russian Ministry of Foreign Affairs protested the unveiling.

[4] This Viljandi County location article is a stub.