Effective photon management is critical to realize high power conversion efficiencies for thin crystalline silicon (c‐Si) solar cells. Standard few‐100‐µm‐thick bulk cells achieve light trapping with macroscopic surface textures covered by thin, continuous antireflection coatings. Such sizeable textures are challenging to implement on ultrathin cells. Here, it is illustrated how nanoscale Mie‐resonator‐arrays with a bimodal size distribution support multiple resonances that can work in concert to achieve simultaneous antireflection and light‐trapping across the broad solar spectrum. The effectiveness of these light‐trapping antireflection coatings is experimentally demonstrated on a 2.8 µm‐thick c‐Si solar cell. The measured short‐circuit current and corresponding power conversion efficiency are notably improved, achieving efficiencies as high as 11.2%. Measurements of the saturation current density on completed cells indicate that thermal oxides can effectively limit surface recombination. The presented design principles are applicable to a wide range of solar cells. A nanophotonic design strategy to realize Mie‐resonator arrays that can combine antireflection and light‐trapping functions in a single, thin layer is discussed. The proposed light‐trapping antireflection coating is experimentally demonstrated on a 2.8 µm‐thick crystalline silicon (c‐Si) solar cell, resulting in a 48% enhancement in the short‐circuit current as compared to a planar cell and an absolute efficiency of 11.2%.