Mechanitis mazaeus, the Mazaeus tigerwing, is a species of butterfly of the family Nymphalidae. It is found in South America.

The larvae have been recorded feeding on Solanum species, including S. subnerme.

Subspecies: 

• M. m. mazaeus (Brazil)
• M. m. beebei Forbes, 1948 (Venezuela)
• M. m. egaensis Bates, 1862 (Brazil)
• M. m. deceptus Butler, 1873 (Ecuador and Peru)
• M. m. fallax Butler, 1873 (Colombia, Brazil and Peru)
• M. m. holmgreni Bryk, 1953 (Bolivia and Peru)
• M. m. lanei Fox, 1967 (Brazil)
• M. m. messenoides C. & R. Felder, 1865 (Colombia)
• M. m. pannifera Butler, 1877 (Suriname, the Guyanas and Brazil)
• M. m. pothetoide d´Almeida, 1951 (Brazil)
• M. m. visenda Butler, 1877 (Brazil)