高锝酸（HTcO₄）是一种锝的含氧酸。它可以由七氧化二锝和水或氧化性酸（硝酸、浓硫酸、王水等）反应制得。它是一种暗红色易潮解的固体。它是一种强酸，很容易给出质子。

Pertechnetic acid (HTcO₄) is a compound of technetium that is produced by reacting technetium(VII) oxide (Tc₂O₇) with water or strong oxidizing acids, such as nitric acid, concentrated sulfuric acid, aqua regia. The dark red hygroscopic substance is a strong acid, with a pK_a of 0.32, as such it exists almost etirely as the pertechnetate ion in aqueous solution.