| State1: | Michigan |
| District1: | 14th |
| Predecessor1: | Lucien Nedzi |
| Successor1: | John Conyers |
| Term Start1: | January 3, 1981 |
| Term End1: | January 3, 1993 |
| State House2: | Michigan |
| District2: | 12th |
| Term Start2: | January 8, 1975 |
| Term End2: | January 14, 1981 |
| Predecessor2: | William B. Fitzgerald, Jr. |
| Successor2: | Curtis Hertel |
| Birth Name: | Dennis Mark Hertel |
| Birth Date: | 7 December 1948 |
| Birth Place: | Detroit, Michigan |
| Party: | Democratic |
| Relatives: | Curtis Hertel (brother) John Hertel (brother) Curtis Hertel Jr. (nephew) Kevin Hertel (nephew) |
| Education: | Eastern Michigan University (BA) Wayne State University (JD) |
| Profession: | lawyer |
Dennis Mark Hertel (born December 7, 1948) is an American politician and lawyer from Michigan. From 1981 to 1993, he served six terms in the U.S. House of Representatives.
Hertel was born in Detroit, Michigan, where he attended the public schools, graduating from Denby High School in 1967. He received a B.A. from Eastern Michigan University in 1971 and a J.D. from Wayne State University in 1974. He was admitted to the Michigan bar in 1975 and commenced practice in Detroit.
He served in the Michigan House of Representatives, 1975–1980, representing the 12th district.
Hertel was elected as a Democrat from Michigan's 14th congressional district to the 97th United States Congress and to the five succeeding Congresses, serving from January 3, 1981 to January 3, 1993. He was not a candidate for renomination in 1992, primarily because his old district was split into four other districts which all had Democratic incumbents.
Since leaving the Congress he has practiced law with the firm of Johnson, Rosati, Galica, Labarge, Aseltyne, Sugameli & Field, P.C. Hertel is now a Senior Counselor with The Livingston Group in Washington, D.C.
After leaving office, he became involved in political reform efforts, including joining nine other former members of Congress to co-author a 2021 opinion editorial advocating reforms of Congress.[1] He is also a member of the ReFormers Caucus of Issue One.[2]
He is a resident of Harper Woods, Michigan.