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http://www.iep.utm.edu/n/natlaw.htm (The Internet Encyclopedia of Philosophy)

The term 'natural law' is ambiguous. It refers to a type of moral theory, as well as to a type of legal theory, despite the fact that the core claims of the two kinds of theory are logically independent. According to natural law ethical theory, the moral standards that govern human behavior are, in some sense, objectively derived from the nature of human beings. According to natural law legal theory, the authority of at least some legal standards necessarily derives, at least in part, from considerations having to do with the moral merit of those standards. There are a number of different kinds of natural law theories of law, differing from each other with respect to the role that morality plays in determining the authority of legal norms.