Conceptually rooted in the efforts to ban indiscriminate weapons and both their immediate and long-term effects, humanitarian mine action and humanitarian disarmament operations have developed significantly since 1988, when the United Nations first took on work on mine action operations for the protection and benefit of local communities. A large part of those operations has been carried out by humanitarian disarmament NGOs such as the Mines Advisory Group (MAG), one of the first organizations to be established on this issue. Drawing on MAG's experience and perspective, this article explores how the humanitarian principles apply to humanitarian disarmament operations. The aim of the article is to show that as an operator on the humanitarian–development nexus, MAG considers the four humanitarian principles as a critical and necessary part of its reference framework due to the influence of the humanitarian disarmament framework, even when operating in the development space. All in all, the case of humanitarian disarmament and MAG's experience are good examples to illustrate where the humanitarian horizon is extended because of long-terms serious needs, and that humanitarian principles remain essential to keep the focus on the needs of affected populations.