Three new species of Myrtaceae from montane forests of the southeastern Brazilian state of Espírito Santo are described, illustrated, and compared with related species: Eugenia crassa Sobral, Myrcia santateresana Sobral, and M. tumida Sobral. Eugenia crassa is closely affined to E. umbrosa O. Berg, from which it is set apart by the smaller and wider leaves (to 170 × 75 mm in E. crassa vs. to 200 × 50 mm), axillary inflorescences, and flowers with larger bracteoles (to 8 mm in E. crassa vs. to 2 mm); M. santateresana is related to M. badia (O. Berg) N. Silveira, from which the new species differs by its smaller leaves (to 140 × 50 mm in M. santateresana vs. to 200 × 50 mm) with discontinuous marginal veins and smaller (buds to 2 mm in M. santateresana vs. to 4 mm), glabrous flowers without a calyx tube; M. tumida is close to M. guianensis (Aubl.) DC., differing by its swollen calyx lobes, larger fruits (to 18 mm in M. tumida vs. to 10 mm), and longer petioles (to 13 mm in M. tumida vs. to 6 mm).