English (US)
Oak Clearwing
Oak Clearwing Borer
Oak Gall Borer
Oak Leafroller
Obelisk DartOblique Banded Leaf Roller
- Oblique Brocade Moth
- Oblique Heterocampa
- Oblique Prominent
- Oblong Sedge Borer
Obscure Pondweed MothObscure sphinx
Obscure Underwing
Occult Sphinx
Oculea Silkmoth
Oenotrus Sphinx
Oithona Tiger Moth
Old Maid
- Old Man Dart Moth
Old Wife Underwing
Oleander Moth
Olivaceous Hawkmoth
Olivaceous Hawkmoth
- Olive Arches
- Olive Green Cutworm Moth
Olive-shaded Bird-dropping Moth
- Omitted Cucullia
- Omitted Hooded Owlet
- Omnivorous Platynota Moth
Once-married Underwing
- One-banded Lichen Moth
One-eyed sphinx
- Opalescent Apamea
Opulent Tiger Moth
Orache Leafminer
- Orange Holomelina
- Orange Virbia
Orange-banded Wasp Moth
Orange-bodied Pygarctia
- Orange-humped Mapleworm
- Orange-humped Oakworm
Orange-patched Smoky Moth- Orange-spotted Idia
Orange-tipped Oakworm Moth
Orba Underwing
Oregon Cycnia Moth
- Oregon Dart
- Oregon Gem Moth
- Oregon Prominent
- Oregon Wainscot Moth
Orizaba silkmoth
Ornate Bella Moth
Ornate Hydriris
Ornate Tiger Moth
Orsilochus Daggerwing
Osage orange Sphinx
Oslar's Imperial Moth
Oslar's Oakworm Moth
- Otter Spiramater Moth
Ottoe Skipper- Oval-based Prominent
- Oval-Based Prominent
- Owlet Moth
Ozark Swallowtail
69 species