There is a Canadian accent (I'm referring to native English-speakers here instead of French, First Nations, or Inuit) and there are regional variations to be sure, but those unfamiliar with it could have difficultly in distinguishing it from American accents - differences can be subtle and even Canadians sometimes have difficulties to tell.
It seems to me there is more regional diversity in American accents than in Canadian ones. I don't feel I have a particularly distinctive Canadian accent (I've spent a lot of time living outside Canada and I tended to "flatten" my speech to make it more comprehensible to non-native speakers). When first meeting them some of my foreign friends could tell I wasn't American and others couldn't. I used to tell them that Canadians are the only people who speak English without an accent but they didn't buy it!
Sometimes I like to think I speak English with a Vulcan accent.
Many Canadian actors have been in Star Trek but has there ever been a character who was identified as Canadian in-universe? There are not very many references to Canada in Star Trek.
It seems to me there is more regional diversity in American accents than in Canadian ones. I don't feel I have a particularly distinctive Canadian accent (I've spent a lot of time living outside Canada and I tended to "flatten" my speech to make it more comprehensible to non-native speakers). When first meeting them some of my foreign friends could tell I wasn't American and others couldn't. I used to tell them that Canadians are the only people who speak English without an accent but they didn't buy it!
Sometimes I like to think I speak English with a Vulcan accent.

Many Canadian actors have been in Star Trek but has there ever been a character who was identified as Canadian in-universe? There are not very many references to Canada in Star Trek.