 Liberalism is more than one thing. On any close examination, it seems to fracture into a range of related but sometimes competing visions. In this entry we focus on debates within the liberal tradition. (1) We contrast three interpretations of liberalism’s core commitment to liberty. (2) We contrast ‘old’ and ‘new’ liberalism. (3) We ask whether liberalism is a ‘comprehensive’ or a ‘political’ doctrine. (4) We close with questions about the ‘reach’ of liberalism — does it apply to all humankind? Must all political communities be liberal? Could a liberal coherently answer this question by saying No? Could a liberal coherently answer this question by saying Yes?