This chapter considers arguments for and against normative naturalism. According to the normativity objection, irreducibly normative, reason-implying claims could not, if they were true, state normative facts that were also natural facts. When some naturalists reply to the normativity objection, they appeal to cases in which words with quite different meanings, and the concepts they express, refer to the same property. According to non-analytical naturalists, though we make some irreducibly normative claims, these claims, when they are true, state natural facts. Such views take two forms. Hard naturalists believe that, since all facts are natural, we do not need to make any such irreducibly normative claims. According to soft naturalists, we do need to make such claims. Soft naturalism, this chapter argues, could not be true. If there were no irreducibly normative truths, our normative beliefs could not help us to make good decisions and to act well.