The list of threatened fauna of Michigan includes almost 400 endangered, threatened and special concern species that are located in Michigan as a part of the fauna of the United States.^[1] Endangered and threatened species in Michigan are protected through the Endangered Species Act of the State of Michigan, part of the 1994 Michigan Natural Resources and Environmental Protection Act. The list was last updated in 2009 to its sixth iteration.^[2] At this time, 69 new species were added, including many species of freshwater mussels and snails, and 13 species were removed.^[1] The state also recognizes species of special concern, which are not protected under the act. These species have low or declining numbers in the state or a need for additional information on their populations in Michigan. If the species' numbers decline, they are moved to threatened or endangered status and afforded protection under the act; if they increase, they are removed from the list without further action.^[2]

Threatened and endangered species can also be listed under the federal Endangered Species Act, passed in 1973; the act covers over 1,250 plant and animal species. Species can be on either list or both lists – representation on one does not automatically determine representation (or status) on the other.^[1][3]

A large portion of the field surveys and research conducted with regards to threatened and endangered species in Michigan is undertaken by the Michigan Natural Features Inventory (MNFI) program. The MNFI program was originally developed in 1980 as part of the state natural heritage programs conceptualized by The Nature Conservancy (TNC), through which it received its first funding. The MNFI program severed relations with TNC in 2000, and became a program of the Michigan State University Extension Services.^[4]

There are twelve species of threatened mammals in Michigan. Five of these are listed as species of threatened concern, three as threatened and four as endangered. Two also have federal listed status as endangered or threatened.

There are five species and subspecies of threatened amphibians in Michigan. Two of these are listed as species of special concern, one as a threatened species and two as endangered. No amphibians with federally listed threatened status have populations in Michigan.

There are eleven species and subspecies of threatened reptiles in Michigan. Of these, six are listed as species of special concern, three as threatened and two as endangered. One species has federal listed status as threatened, while another is a candidate for federal listing.

There are 42 threatened species and subspecies of birds in Michigan. Of these, 18 are listed as species of special concern, 14 as threatened and 9 as endangered. One additional species is listed as extinct in Michigan, although it previously had a population in the state. Two species have federal listed status as endangered.

There are 35 species and subspecies of threatened fish in Michigan. Of these, eight are species of special concern, nine are threatened and another nine are listed as endangered. An additional nine species that previously had populations in Michigan are now considered extinct in that state. None of the federally listed species of threatened fish have populations in Michigan.

There are 28 species and subspecies of threatened freshwater mussels in Michigan. Of these, 9 are species of special concern, 6 are listed as threatened and 13 are endangered. Six are also federally listed as endangered.

There are 61 species and subspecies of threatened land and freshwater snails in Michigan. Of these, 38 are species of special concern, 10 are listed as threatened and 13 are listed as endangered. No federally listed species of snails have populations in Michigan.

There are seven threatened species of fingernail and pea clams in Michigan, all listed as species of special concern. None of the species with populations in Michigan are federally listed as threatened.

• List of fauna of Michigan