Ornithonyssus bacoti or so-called tropical rat mite has a wide host range which includes wild rodents and small mammals. The mite is known to bite humans and cause irritation. But the case reports are few in pet rabbits. Two Lionhead rabbits (Oryctologus cuniculus) were referred to the local animal hospital, and many mites were detected on the body. Mites were identified as O. bacoti by the scanning electron microscopical study. This communication describes the first record of pet rabbits affected with O. bacoti in Korea.