For Canadian players, using a Canadian online casino is legal. Using online casinos that are based overseas may be unlawful, but this is largely overlooked. Each Canadian province has the authority to regulate remote gambling within that province. Online gambling is legal in all provinces except for Saskatchewan, but the laws in Manitoba are uncertain.
Players should choose to gamble with casinos that are licensed by a respected gambling authority. These include UKGA, MGA or Kahnawake. It is also good if it has an eCOGRA seal of approval.