No, bears are not marsupials. Bears belong to the order Carnivora and are classified as placental mammals, while marsupials belong to the order Diprotodontia and are characterized by their unique reproductive process.
Marsupials, like kangaroos and koalas, give birth to relatively undeveloped young that typically continue to develop outside the womb while attached to a pouch on the mother’s belly. This is quite different from bears, which carry their young in the womb until they are more fully developed. When a bear gives birth, the young are born live and are generally more advanced compared to those of marsupials.
Therefore, while both bears and marsupials are mammals, their reproductive strategies and classifications are distinctly different.