By applying Einstein's mass-energy equivalence (E = mc²) to Landauer's thermodynamic bound on information (E ≥ k_B T ln(2)), I derive a fundamental unit of information-energy: the Infoton, with mass 3.19 × 10⁻³⁸ kg. I propose this represents a minimum quantized unit of information on the scale of sub-atomic particles and discuss measurement implications for information-fundamental physics.