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Funding: We acknowledge the financial support of the Max Planck Society. BZ, CF, APM, and CWH acknowledge in addition financial support from the Deutsche Forschungsgemeinschaft through SFB 1143 (Project ID 247310070). KM and CF acknowledge financial support from the European Research Council (ERC), Advanced Grant No. 742068 ‘TOPMAT’; European Union’s Horizon 2020 research and innovation program (Grant Nos. 824123 and 766566). Additionally, KM acknowledges funding support from Max Planck Society under Max Planck-India partner group project and the Board of Research in Nuclear Sciences (58/20/03/2021- BRNS, DAE-YSRA), Department of Atomic Energy (DAE), Government of India. H M L N acknowledges support from the Alexander von Humboldt Foundation through a Research Fellowship for Postdoctoral Researchers. Research in Dresden benefits from the environment provided by the DFG Cluster of Excellence ct.qmat (EXC 2147, project ID 390858940). The Mn3X family of compounds was the first in which a large anomalous Hall effect (AHE) was predicted to arise from a purely antiferromagnetic structure, due to the Berry curvature in momentum space. Nearly simultaneously with this prediction, a large AHE was observed experimentally in one of the hexagonal members of this family, Mn3Sn. Aligning antiferromagnetic domains, a necessary step for observation of the AHE, is more challenging for the cubic members of the Mn3X family, due to a combination of smaller spontaneous ferromagnetic moments and much stronger magnetic anisotropy. Here, we use a combination of uniaxial stress and applied magnetic field to align domains of bulk single-crystal Mn3Pt, and demonstrate for the first time a substantial AHE in a bulk sample of a cubic member of the Mn3X family. The AHE remains locked in with essentially no quantitative variation when the stress is ramped back to zero, which shows that it is not a consequence of any stress-induced ferromagnetic moment. Publisher PDF