We present an integrative theoretical model that specifies social psychological mechanisms by which utopian thinking, which activates the social imagination, may enhance collective action intentions oriented toward social change and human progress. The model synthesizes complementary insights from interdisciplinary research programs on utopianism, hope, construal level, and system justification to identify mechanisms by which imagining better societies: (a) increases social hope, (b) yields an abstract mindset that bridges the psychological distance between the status quo (“here and now”) and a better possible future, (c) decreases system justification motivation, and (d) promotes social justice‐oriented forms of collective action.