Roger D. Grimes CM (born May 2, 1950) is a Canadian politician from Newfoundland and Labrador. Grimes was born and raised in the central Newfoundland town of Grand Falls-Windsor.

Grimes is a former leader of the province's Liberal Party and was its eighth premier from February 2001 until November 2003.

A teacher by profession, Grimes was elected president of the Newfoundland and Labrador Teachers’ Association in 1985, a position he held for two years.

In 1989, Grimes was elected to the House of Assembly representing Exploits district.

Grimes entered the cabinet of Premier Clyde Wells in 1991 as Minister of Employment and Labour Relations, followed by service as Minister of Tourism, Culture and Recreation. Under Premier Brian Tobin, Grimes was by now a senior Minister and served in the portfolios of Education, Mines and Energy, and Health and Community Servies.

Grimes won the 2001 Liberal Party of Newfoundland and Labrador Leadership to become Party Leader, defeating John Efford by 14 votes in a fierce and divisive contest in Mount Pearl. Efford and fellow leadership contestant Paul Dicks subsequently left provincial politics saying they could not work under the leadership of Grimes.

Grimes was sworn in as Premier on February 13, 2001. The same year he became Premier, the name of the province was officially changed to Newfoundland and Labrador.

In 2002, Grimes called for a review of the Act of Union by which the province had become a part of Canada and on July 2, 2003, the findings of the Royal Commission on Renewing and Strengthening Our Place in Canada were released. It noted the following stressors in the relationship between the province and Canada: