O. flavescens

O. flavescens may refer to:


 * Obolcola flavescens, a geometer moth
 * Oligoryzomys flavescens, a southern South American rodent
 * Ommatius flavescens, a robber fly
 * Onchidella flavescens, a sea slug
 * Opistophthalmus flavescens, a burrowing scorpion
 * Orchesella flavescens, a slender springtail
 * Oria flavescens, an owlet moth
 * Orthosia flavescens, an owlet moth
 * Otaria flavescens, a sea lion
 * Ozarba flavescens, an owlet moth