Can I deposit my money order into someone else's bank account?

The holder of an account takes responsibility for the outcome of any check deposited into their account. Thus, the bank may require that the person who owns the account also sign the check (and even be present during the deposit) to verify authorization for the deposit. Even though money orders are supposed to be verified funds, the bank cannot risk that the account holder will claim the deposit wad unauthorized if they are charged if the check us returned.