A. excelsa may refer to:
Acacia excelsa, a tree species Acropolitis excelsa, a moth of the family Tortricidae Araucaria excelsa, commonly known as the Norfolk Island pine, a tree species in the family Araucariaceae Alphitonia excelsa, commonly known as the red ash or soap tree, a species of tree in the family Rhamnaceae Amanita excelsa, a fungus Autographa excelsa, a moth of the family Noctuidae