Oak Jewel-Beetle 
Oak Leaf Rolling Weevil 
Oak Leafrolling Weevil 
Oak roller weevil 
Oak timberworm 
Oberea oculata 
Oberea praelonga 
Oblique-lined tiger beetle 
Obrida fascialis 
Obrium brunneum 
Obrium rufulum 
Obscure Root Weevil 
Obscure sap beetle 
Obscurella Jewel Beetle 
Odontocheila cayennensis 
Odontocorynus salebrosus 
Odontolabis brookeana 
Odontolabis cephalotes 
Odontolabis cypri 
Odontolabis femoralis 
Odontolabis imperialis imperialis 
Odontolabis leuthneri 
Odontolabis lowei 
Odontolabis sommeri