The following collected guides break down how to recognize common fly species belonging to several families, with a focus on the diversity of North America.

Additional notes: The following notes were assembled over time on the identification of Diptera species, chiefly to facilitate photo/field ID e.g. on iNaturalist. These are less fully developed than those published above, but should be accessible to anyone sufficiently determined and patient. Feel free to reach out to the authors or editors with questions.