In this article, I propose that engagement in nursing practice affords an epistemic advantage and should be included in defining nursing science and as a warrant for scientific knowledge. I appeal to standpoint epistemology, a philosophical theory, to support my proposal. A new conception of objectivity, which aligns with the contemporary practice of science and standpoint theory, is discussed. The article presents a preliminary theory of nursing standpoint theory that explains epistemic advantage of a practicing nurse. Open questions about nursing science conclude the article.