Oak Spider 
Oecobius annulipes 
Olios giganteus 
Opadometa sarawakensis 
Opisthoncus alborufescens 
Opisthoncus nigrofemoratus 
Opisthoncus polyphemus 
Opisthoncus quadratarius 
Opisthoncus sexmaculatus 
Orange Huntsman Spider 
Orchard spider 
Oriental spiny orb-weaver 
Ornamental tree trunk spider 
Orsinome vethi 
Oval Saint Andrew's Cross Spider 
Oxyopes birmanicus 
Oxyopes elegans 
Oxyopes flavipalpis 
Oxyopes gracilipes 
Oxyopes heterophthalmus 
Oxyopes javanus 
Oxyopes lineatipes 
Oxyopes punctatus 
Oxyopes salticus