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Thermodynamic signature of Dirac electrons across a possible topological transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>ZrTe</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>
We combine transport, magnetization, and torque magnetometry measurements to investigate the electronic structure of ${\mathrm{ZrTe}}_{5}$, a system that is thought to be near a topological phase transition. At fields beyond the quantum limit, we observe a magnetization reversal from paramagnetic to diamagnetic response, which is characteristic of a Dirac semimetal. …