Most people abhor war in a general way while reluctantly accepting that sometimes war is justified. Libertarians, in particular, have historically shown a marked dislike of war. Here I explore the connections between libertarian doctrine and their opposition to war, with the caveat that some of these positions are shared by non-libertarians as well. As we will see, a commitment to libertarianism is consistent both with a pacifist view and with the contrary belief that some wars may be (reluctantly) justified.