| Honorific-Prefix: | The Honourable |
| Calvin Ruck | |
| Honorific-Suffix: | CM |
| Office: | Canadian Senator for Nova Scotia |
| Term Start: | 1998 |
| Term End: | 2000 |
| Nominator: | Jean Chrétien |
| Appointed: | Roméo LeBlanc |
| Birth Date: | 25 September 1925 |
| Birth Place: | Sydney, Nova Scotia, Canada |
| Death Place: | Ottawa, Ontario, Canada |
| Party: | Liberal |
Calvin Woodrow Ruck (September 4, 1925 – October 19, 2004) was a human rights[1] activist and a member of the Senate of Canada. He was born in Sydney, Nova Scotia; his parents were immigrants to Canada from Barbados.
Ruck's life has been documented in a book entitled Winds of Change: Life and Legacy of Calvin W. Ruck, which was penned by his granddaughter, Lindsay Ruck.
He held a number of positions within the Nova Scotia Association for the Advancement of Coloured People and was a member for most of his adult life. In the 1950s and 1960s, he organized campaigns against businesses in the Dartmouth area, including barber shops, which refused to serve black people. He worked with the Nova Scotia Human Rights Commission from 1981 to 1986. He campaigned tirelessly for the Canadian Government to recognize the heroics of Jeremiah Jones during the Battle of Vimy Ridge.
In 1998, he was appointed to the Senate of Canada by Prime Minister Jean Chrétien, where he served until reaching the mandatory retirement age of 75 in 2000.
He died at his home in Ottawa on October 19, 2004, at the age of 79.
Ruck published two books about Canada's No. 2 Construction Battalion, the only all-black battalion to serve in World War I: