It is rarely reported that collinear antiferromagnetic (AFM) metals can exhibit the anomalous Hall effect (AHE). In this Letter, based on symmetry analysis and the first-principles electronic structure calculations, we predict that two existing collinear antiferromagnets ${\mathrm{Nb}}_2{\mathrm{FeB}}_2$ and ${\mathrm{Ta}}_2{\mathrm{FeB}}_2$, whose Néel temperatures are above room temperature, have a very large AHE with anomalous Hall conductance (AHC) $-100$ and $-54{\mathrm{\Omega }}^{-1}{\mathrm{cm}}^{-1}$, respectively. We further complete the symmetry requirements for realizing the AHE in collinear antiferromagnetism.

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• Electrical properties
• Electronic structure
• First-principles calculations
• Hall effect
• Magnetism
• Magnetotransport
• Spin-orbit coupling
• Transport phenomena