Go-striped Bee Fly 
Gold-ringed Nevada-robber 
Golden Head Rutilia 
Golden Snipe Fly 
Golden-backed Snipe Fly 
Goldenrod bunch gall 
Goldenrod gall fly 
Gonia frontosa 
Gouty Vein Midge 
Grape Filbert Gall 
Grape Midge 
Grape Tube Gallmaker 
Graphomya maculata 
Grass Sheathminer Fly 
Grasshopper Bee Fly 
Greater Punctate Sedgesitter 
Green Horse Fly 
Green long-legged fly 
Grey-spotted Sedgesitter 
Grey-striped Fly 
Grey-wing Brown Bee Fly 
Guava fruit fly 
Gymnoclytia occidua 
Gymnosoma nudifrons