高铼酸是一种无机化合物，化学式为HReO₄，是一种强酸。

七氧化二铼溶于水，可以得到高铼酸。另外，金属铼或者新沉淀的二氧化铼溶于过氧化氢，也能得到高铼酸。

其溶液的浓缩应该控制在90℃以下，避免分解。

Perrhenic acid is the chemical compound with the formula Re
2O
7(OH
2)
2. It is obtained by evaporating aqueous solutions of Re
2O
7. Conventionally, perrhenic acid is considered to have the formula HReO
4, and a species of this formula forms when rhenium(VII) oxide sublimes in the presence of water or steam. When a solution of Re
2O
7 is kept for a period of months, it breaks down and crystals of HReO
4·H
2O are formed, which contain tetrahedral ReO−
4 For most purposes, perrhenic acid and rhenium(VII) oxide are used interchangeably. Rhenium can be dissolved in nitric or concentrated sulfuric acid to produce perrhenic acid.