Are single people allowed to adopt?

Not usually through an adoption agency in Canada at least. However one can go through the adoption process through a lawyer. Money talks! Often actors or people that are financially successful have ways of adopting if single. Another method is to be artificially inseminated or, surrogate mother (meaning someone gets pregnant for you, you usually pay the medical bills up until the birth of the baby and even after the birth you may have agreed to pay the biological mother an amount of money.) These are just some ideas.