Abstract
This essay is intended to provide an introductory overview of the philosophical problems involved in understanding the nature and value of liberty, and the range and categories of philosophic solutions that have been offered to those problems. This essay covers the distinction between negative and positive liberty, MacCallum's tripartite analysis of liberty, debates over the subject of liberty and the significance of various constraints on liberty, and the significance of philosophical analyses of liberty for political philosophy. Concludes with a short bibliographical essay with suggestions for further reading. Appropriate for first-year to advanced undergraduates.