This peer reviewed text includes a dichotomous key to all 15 genera of Mantodea found in the U.S. and Canada. Extremely detailed descriptions are provided for each of the 27 species found within this region, including two newly listed invasive species and two newly described species. One new genus is established along with several taxonomic revisions and clarifications. Species treatments include taxonomic illustrations, precise morphological descriptions, accurate morphometry, complete natural history documentation, exhaustive historical literature review, and detailed distribution range maps. There are 183 illustrations contained within the 291 pages of text, including 115 color photographs of live specimens.