| Honorific-Prefix: | The Honourable |
| Dennis Patterson | |
| Office: | Deputy Leader of the Canadian Senators Group |
| Leader: | Scott Tannas (acting) |
| Predecessor: | Josée Verner |
| Successor: | Rebecca Patterson |
| Term Start: | March 21, 2022 |
| Term End: | October 31, 2023 |
| Order1: | 5th |
| Office1: | Premier of the Northwest Territories |
| Term Start1: | November 12, 1987 |
| Term End1: | November 14, 1991 |
| Successor1: | Nellie Cournoyea |
| Office5: | Canadian Senator from Nunavut |
| Term Start5: | August 27, 2009 |
| Term End5: | December 29, 2023 |
| Nominator5: | Stephen Harper |
| Appointer5: | Michaëlle Jean |
| Predecessor5: | Willie Adams |
| Successor5: | TBD |
| Office9: | Member of the Legislative Assembly of the Northwest Territories for Frobisher Bay |
| Term Start9: | October 1, 1979 |
| Term End9: | October 16, 1995 |
| Predecessor9: | Riding established |
| Successor9: | Ed Picco |
| Birth Name: | Dennis Glen Patterson |
| Birth Date: | 30 December 1948 |
| Birth Place: | Vancouver, British Columbia, Canada |
| Nationality: | Canadian |
| Party: | Canadian Senators Group |
| Otherparty: | Conservative (2009–2022) |
| Occupation: | Lawyer |
| Profession: | Politician |
Dennis Glen Patterson (born December 30, 1948) is a Canadian politician and lawyer who was senator from Nunavut from 2009 until his retirement in 2023. He was the fifth premier of the Northwest Territories from 1987 to 1991. Patterson played a key role in the settlement of the Inuvialuit final agreement and the Nunavut final land claim agreement. Patterson was named to the Senate by Prime Minister Stephen Harper, sitting as a Conservative until 2022, when he joined the Canadian Senators Group (CSG).
He served as a member of the Legislative Assembly of Northwest Territories (MLA) for Frobisher Bay and Iqaluit from 1978 to 1995, as minister of education, justice and municipal affairs, and was chosen as the fifth premier of Northwest Territories in 1987, serving to 1991. He headed the campaign that led to the creation of Nunavut in 1999.[1]
Patterson has served as a director of the Northwest Territories Law Foundation and as chair of the Northwest Territories and Nunavut Legal Services Board until 2000. He became a private consultant in 2001.[2]
Patterson was named to the Senate of Canada by Stephen Harper on August 27, 2009.[3] He represented Nunavut as a Conservative until February 4, 2022, when he announced he would be leaving the Conservative Senators Group to join the Canadian Senators Group in protest over other Conservative members support of the "Freedom Convoy" protests.[4] Patterson retired from the Senate of Canada on December 29, 2023.[5]