The paper concerns the idea of freedom and her limits in the thought of the some representatives of classical liberalism. The paper has three parts: 1) freedom as a feature of the personality and her different forms (personal and social, positive and negative); 2) ideas if the English philosophers (T. Hobbes, J. Locke, D. Hume, J.S. Milli); 3) ideas of the French philosophers (Ch. Montesquieu, J.J. Rousseau, A. De Tocqueville). According to this thinkers human freedom is not a absolute value but has many limits (social contract, law, customs, religion and ethics).