Uranium $5f$ electrons often yield heavy-fermion behavior via Kondo screening. However, the pronounced bad-metallic transport of uranium mononitride (UN) defies an incoherent Kondo explanation. Using density-functional theory combined with dynamical mean-field theory, we show that UN is a strongly correlated bad metal. The dominant correlations arise from intra-atomic Hund's exchange interaction between two $5f$ electrons, which aligns local magnetic moments and produces large quasiparticle mass renormalization. This identifies UN as a $5f$-electron analog of a Hund's metal—a paradigm chiefly associated with transition-metal $d$ systems. Our results motivate a reexamination of the interplay between Mott, Kondo, and Hund-driven correlations across actinide correlated materials.

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• Electronic structure
• Strongly correlated systems
• Dynamical mean field theory