This article explores the figure of the “feminist killjoy,” a woman who disrupts social harmony by pointing out sexism, injustice, or inequality, and is often seen as spoiling others’ happiness. Rather than viewing this negativity as a flaw, the authors argue it is a form of political agency: refusing to “be happy” within oppressive systems becomes an act of resistance. The feminist killjoy exposes how ideals of happiness and harmony can sustain inequality, showing that discomfort and dissent are essential to feminist politics and social transformation.