AbstractAgainst current developments in the sociology of IR, from new systemic theorizations of world society to Bourdieusian approaches to the practices of IR scholars, this article claims that relevant problems remain regarding how IR theorizes its social location and reconciles the social character of the world it observes with the social character of its observations. To reformulate these problems, the article draws from an underused paradigm of social system theorizing, sociocybernetics, offering a radical constructivist treatment of the problem of observation and reflexivity. Elaborating the notion of second-order cybernetics and Niklas Luhmann's take on the reproduction of observing social systems, the article argues that IR can be conceived as an observing social system that adapts by altering and subdividing the semantic boundaries of its systemic communications, that is, IR theories. This socio-heuristic process structures both the first-order observations IR makes about the world, as well as second-order observations of itself. In this manner, the article argues that sociocybernetics-informed sociology of IR communications can contribute to a more nuanced understanding of IR as a social system that observes society from society.