Mastixia is a genus of about 19 species of resinous evergreen trees, usually placed in the family Cornaceae.

Its range extends from India through Southeast Asia and New Guinea to the Solomon Islands.

[2] Mastixia species have alternate or opposite simple broad leaves, many-flowered inflorescences, and blue to purple drupaceous fruits.

The classification of Mastixia is inconsistent due to continuing investigation into its phylogenetic relationships.

[4] As of July 2014[update] the World Checklist of Selected Plant Families and The Plant List recognise about 30 accepted taxa (of species and infraspecific names).