A. formosa

A. formosa may refer to:


 * Aliciella formosa, a phlox endemic to New Mexico
 * Amandava formosa, an estrildid finch
 * Anas formosa, a dabbling duck
 * Angaria formosa, a sea snail
 * Aplysiopsis formosa, a sea slug
 * Aquilegia formosa, a wildflower native to western North America
 * Aranea formosa, an orb-web spider