High entropy alloys (HEAs) show demonstrated unique and attractive properties for various engineering applications. Significant advancements in HEAs have revealed promising properties as ductility, toughness, hardness, and resistance to corrosion. The HEAs corrosion behavior in aqueous solutions attracted the interest recently of researchers to explore the range of its possible applications. The new Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂₀ high entropy alloy (HEA) is investigated as a potential corrosion-resistant alloy in acidic media. Cast Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂₀ HEA was cold rolled up to 70% reduction then solution treatment. The micro-hardness, X-ray diffraction, and microstructure of the Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂₀ HEA were investigated after solution treatment. The electrochemical experiments were performed at room temperature with two concentrations, 0.5 M and 1 M, in both NaCl and H₂SO₄ solutions. The potentiodynamic response is used to calculate corrosion rates. In addition, for the various conditions, cyclic voltammetry was investigated. Surface characterization of corroded samples was provided using scanning electron microscopy and energy dispersive x-ray analyzer. The results demonstrate that the Al₁₂Cr₁₂Fe₃₅Mn₂₁Ni₂ HEA in NaCl has a good corrosion resistance especially in 1 M concentrations.