Northern Saint Andrew's Cross Spider 
Northern yellow sac spider 
Oak Jumping Spider 
Oak Jumping Spider 
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