| John W. Livingston Papers | 1947-1955 | | LP000259 |
| Livonia Education Association Collection | 1945 to 1968 | | LR000305 |
| Percy Llewellyn Papers | 1938-1967 | | LP000442 |
| Frank Lohr Papers | 1939-1961 | | LP00043C |
| Robert Lopez Papers | 1971-1987 | | LP001482 |
| Mrs. Stanley Lowe Papers | 1857 | | LP000325 |
| George Lutzai Papers | 1919-1965 | | LP000019 |
| George Lyons Papers | 1940-1964 | | LP000006 |
| Hugh Macmillan Papers | 1917-1921 | | LP000265 |
| Nora Maczko Papers | 1985-1986 | | LP001421 |
| Olga Madar Papers | circa 1930-1999 | | LP000203 |
| Mae Mallory Papers | 1961-1967 | | UP000955 |
| Michael Manning Papers | 1934-1942 | | LP000018 |
| Mark Adams Radio Program Records | 1948-1949 | | UP000489 |
| Frank Marquart Papers | 1936-1975 | | LP000017 |
| Blaine Marrin Papers | 1947-1955 | | LP000204 |
| Gabriel R. Mason Papers | 1970 | | LP000414 |
| Fred Masters Papers | 1942-1945 | | LP000181 |
| Alan W. Mather Papers | 1930-1982 | | LP000756 |
| Joseph Mattson Papers | 1947-1950 | | LP000207 |
| Emil Mazey Papers | 1933-1981 | | LP001149 |
| Ernest Mazey Papers | 1942-1979 | | LP000639 |
| James J. McClendon Papers | 1932-1969 | | UP000157 |
| Mary Upshaw McClendon Papers | 1969-1990s | | LP000784 |
| Herbert T. McCreedy Papers | 1934-1973, bulk 1935-1965 | | LP000991 |
| Wade H. McCree, Jr. Papers | 1937-2003, bulk 1954-1987 | | UP000822 |
| Richard McGhee Papers | 1958-1978, bulk 1963-1977 | | UP000742 |
| Ashby C. McGraw Papers | 1935-1965 | | LP000335 |
| Tracy William McGregor Papers | 1846-1970, bulk 1891-1954 | | UP001387 |
| Patrick Vincent McNamara Papers | 1942-1966 | | UP000189 |
| Thomas McNett Papers | 1936-1970 | | LP000336 |
| Norman McRae Papers | 1960s-1980s | | UP000337 |
| Stoyan Menton Papers | 1935-1976, bulk 1944-1958 | | LP000802 |
| Merrill-Palmer Institute Records | 1920-1981, bulk 1928-1973 | | UR002127 |
| Merrill-Palmer Institute: Armin Grams Records | 1962-1977 | | UR001066_Grams |
| Merrill-Palmer Institute: Dr. Esther McGinnis Records | 1936-1952, bulk 1941-1952 | | UR002124 |
| Merrill-Palmer Institute: Dr. Francis H. Palmer Records | 1978-1983, bulk 1978-1981 | | UP002123 |
| Merrill-Palmer Institute: Dr. J. William Rioux Records | 1960-1973, bulk 1967-1973 | | UR002119 |
| Merrill-Palmer Institute: Dr. Michael D. Usdan Records | 1973-1978, bulk 1974-1978 | | UP002122 |
| Merrill-Palmer Institute: Dr. Pauline Park Wilson Knapp Records | 1950-1968, bulk 1952-1967 | | UR002120 |
| Merrill-Palmer Institute: Dr.William McKee Records | 1952-1978, bulk 1955-1976 | | UR002121 |
| Merrill-Palmer Institute: Edna Noble White Records | 1902-1966 | | UR001066_White |
| Merrill-Palmer Institute: Ernest Groves Records | 1912-1947, bulk 1930s-1940s | | UR001066_Groves |
| Merrill-Palmer Institute: Ethel B. Waring Records | 1920-1971 | | UR001066_Waring |
| Merrill-Palmer Institute: Icie G. Macy Hoobler Papers | 1918-1963, bulk 1920s-1950s | | UR001066_Hoobler |
| Merrill-Palmer Institute: Kresge Historical Library Records | 1911-1980, bulk 1920-1980 | | UR001066_Kresge |
| Merrill-Palmer Institute: Lawrence Kelso Frank Papers | 1922-1968, bulk 1960-1968 | | UR001066_Kelso |
| Merrill-Palmer Institute: Merrill and Palmer Families Records | 1848-1926 | | UR001066_family |
| Merrill-Palmer Institute: Merrill-Palmer Corporation Records | 1916-1981 | | UR001066_corp |
| Metropolitan Coalition of Women | 1968-1973 | | LR000816 |
| Metropolitan Coalition of Women Records | 1968-1973 | | UR000816 |
| Metropolitan Detroit Building Fund Records | 1948-1971 | | UR001289_MDBF |
| Metropolitan Detroit Council of Churches Records | 1922-1967 | | UR000319 |
| Metropolitan Detroit Health Education Council Records | 1974-1989 | | UR001431 |
| Metropolitan Detroit Medical Library Group Records | 1947-1997 | | UR001106 |
| A.G. and Marie Mezerik Papers | 1935-1985, bulk 1937-1938 | | UP000476 |
| Lewis H. Michener Papers | 1938-1974 | | LP000178 |
| Michigan Citizens Lobby Records | 1973-1981 | | UR001052 |
| Michigan Coalition for Human Rights Records | 1975-2005, bulk 1981-1995 | | UR001790 |
| Michigan Commission On Displaced Persons Records | 1937-1965 | | UR000129 |
| Michigan Constitutional Convention Records | 1961 | | LR000154 |
| Michigan Farm Worker Ministry Coalition Records | 1950-1990 | | LR000895 |
| Michigan Welfare League Records | 1916-1965 | | UR000332 |
| Isadore Miles Papers | 1958-1967 | | LP000389 |
| Ruth Milkman Papers | 1975-1994, bulk 1978-1991 | | LP002097 |
| Ira A. Miller Papers | 1980 | | LP000976 |
| Richard Miller Papers | 1956-1965 | | UP000448 |
| Jewel Mills Papers | 1962-1968 | | LP000287 |
| Robert J. Mills Papers | 1954-1980 | | LP000209 |
| Miners For Democracy Records | 1941-1974, bulk 1969-1972 | | LR000589 |
| George F. Montgomery Jr. Papers | 1965-1970 | | UP000599 |
| Prince Moon Papers | 1974-1988 | | LP001413 |
| Tom Mooney Papers | 1914-1919 | | |
| Loretta Moore Papers | 1950-1978 | | UP000982 |
| Ernest J. Moran Papers | 1942-1973 | | LP000641 |
| James B. Morrissey Papers | 1969-1986 | | LP001358 |
| Ken Morris Papers | 1937-1983 | | LP000331 |
| Wyndham Mortimer Papers | 1934-1973, bulk 1940-1962 | | LP001171 |
| Marion Moses, M. D. Papers | 1960-1970 | | LP001173 |
| Bette Murphy Papers | 1942-1981 | | LP001357 |
| Vincent J. Murray Papers | 1958 | | LP000727 |
| John Musial Papers | 1949-1982, bulk 1963-1974 | | UP002184 |
| Tom Myerscough Papers | 1965-1982 | | LP000622 |
| NAACP Detroit Branch Records | 1943-1970 | | UR000244 |
| NALC Department of Research and Education Records | 1968-1985, bulk 1977-1985 | | LR001918 |
| NALC Executive Assistant to the President: F. John Miller Records | 1889-1999, bulk 1984-1999 | | LR001916 |
| NALC Office of the President: James H. Rademacher Records | 1950-1987, bulk 1968-1977 | | LR001313 |
| NALC Auxiliary Records | 1905-1994 | | LR001922 |
| NALC Office of the Executive Vice President Records | 1965-1997, bulk 1976-1997 | | LR001910 |
| NALC Office of the President: J. Joseph Vacca Records | 1966-1979, bulk 1976-1979 | | LR001914 |
| NALC Office of the Secretary-Treasurer Records | 1921-1995, bulk 1971-1995 | | LR001751 |
| NALC Office of the Vice President Records | 1968-1986, bulk 1975-1986 | | LR001917 |
| NALC City Delivery Director Records | 1957-1985, bulk 1972-1985 | | LR001912_CD |
| NALC Comptroller's Office Records | 1892-1981, bulk 1959-1981 | | LR001912_CO |
| NALC Information Center Records | 1889-2006, bulk 1960-2006 | | LR001912_IC |
| NALC Office of the President: Vincent Sombrotto Records | 1979-1999 | | LR001915 |
| NALC Public Relations Department Records | 1985-1995 | | LR001912_PR |
| National Campaign For Agricultural Democracy Records | 1967-1970 | | LR000487 |
| National Caucus of Labor Committees Records | 1965-1982, bulk 1978-1982 | | LR000376_NCLC |
| National Farm Worker Ministry Records | 1939-1985, bulk 1950-1980 | | LR000338 |