Jatun Q'asa or Hatun Q'asa (Quechua jatun (in Bolivia) or hatun big, q'asa mountain pass, "big mountain pass", also spelled Jatun Casa, Jatún Casa, Jatun Khasa, Jatunjasa) may refer to:

• Hatun Q'asa, a mountain in the Apurímac Region, Peru
• Hatun Q'asa (Arequipa), a mountain in the Arequipa Region
• Hatun Q'asa (Cusco), a mountain in the Cusco Region, Peru
• Jatun Q'asa (Azurduy), a mountain in the Azurduy Province, Chuquisaca Department, Bolivia
• Jatun Q'asa (Chuquisaca), a mountain in the Oropeza Province, Chuquisaca Department, Bolivia
• Jatun Q'asa (Cochabamba), a mountain in the Cochabamba Department, Bolivia
• Jatun Q'asa (Potosí), a mountain in the Potosí mountain range, Potosí Municipality, Tomás Frías Province, Potosí Department, Bolivia
• Jatun Q'asa (Umallani), a mountain near Umallani in the Potosí Municipality, Tomás Frías Province, Potosí Department, Bolivia
• Jatun Q'asa (Yocalla), a mountain in the Yocalla Municipality, Tomás Frías Province, Potosí Department, Bolivia
• Jatun Q'asa (Zudáñez), a mountain in the Jaime Zudáñez Province, Chuquisaca Department, Bolivia

• Acleris strigifera
• Acleris subcoprana
• Acleris submaccana
• Acleris subnivana
• Acleris supernova
• Acleris tabida
• Acleris taiwana
• Acleris takeuchii
• Acleris thiana
• Acleris thomasi
• Acleris thylacitis
• Acleris tibetica
• Acleris tigricolor
• Acleris tremewani
• Acleris triana
• Acleris trujilloana
• Acleris tsuifengana
• Acleris tungurahuae
• Acleris tunicatana
• Acleris ulmicola
• Acleris umbrana
• Acleris undulana
• Acleris uniformis
• Acleris venatana
• Acleris yasudai