The article wants to set the stage for the rest of the special issue titled ‘From resistance to legitimation: The changing role of humour in politics’ by providing an overview of some the key concepts, theories and approaches to humour. It begins by considering different concepts of and some of the theoretical approaches to the functions and implications of humour including relief, superiority and incongruity as well as carnival theory and the role of parody. From these ideas, it outlines several functions of using humour in politics which include the raising of public attention and distraction, provocation and isolation from critique, humour as a means of persuasion and anxiety management as well as the use of humour as a means of stabilizing and de-stabilizing hierarchies. Turning to the main contribution of the special issue it outlines the changing relationship of humour in politics from a means of critique of power to a means of legitimation of power. It places the contribution of the special issue in this debate and holds that humour plays an ambiguous role and calls for further research into the dark and unfunny side of humour in politics.