The grey-breasted spiderhunter (Arachnothera modesta) is a species of bird in the Nectariniidae family.It is found in Brunei, Indonesia, Malaysia, Myanmar, Singapore, Thailand, and Vietnam.Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests. It is sometimes considered conspecific with the streaky-breasted spiderhunter.