We report here on the first hydrogen determinations in the volcanic gas plume of Mount Etna, in Italy, which we obtained during periodic field surveys on the volcano's summit area with an upgraded MultiGAS. Using a specific (EZT3HYT) electrochemical sensor, we resolved H₂ concentrations in the plume of 1–3 ppm above ambient (background) atmosphere and derived H₂‐SO₂ and H₂‐H₂O plume molar ratios of 0.002–0.044 (mean 0.013) and 0.0001–0.0042 (mean 0.0018), respectively. Taking the above H₂‐SO₂ ratios in combination with a time‐averaged SO₂ flux of 1600 Gg yr⁻¹, we evaluate that Etna contributes a time‐averaged H₂ flux of ∼0.65 Gg yr⁻¹, suggesting that the volcanogenic contribution to the global atmospheric H₂ budget (70,000–100,000 Gg yr⁻¹) is marginal. We also use our observed H₂‐H₂O ratios to propose that Etna's passive plume composition is (at least partially) representative of a quenched (temperatures between 750°C and 950°C) equilibrium in the gas‐magma system, at redox conditions close to the nickel‐nickel oxide (NNO) mineral buffer. The positive dependence between H₂‐SO₂, H₂‐H₂O, and CO₂‐SO₂ ratios suggests that H₂ is likely supplied (at least in part) by deeply rising CO₂‐rich gas bubbles, fluxing through a CO₂‐depleted shallow conduit magma.