碘酸盐是碘酸所成的盐类，含有三角锥型的碘酸根离子—IO₃，其中碘的化合价为+5。

碘酸盐可由用硫醚还原高碘酸盐制得，副产物为亚砜。

碘酸盐的例子有：

同为卤素的氯和溴也可形成氧化态为V的酸盐，称为氯酸盐和溴酸盐，与碘酸盐的性质类似。

碘酸盐与酸反应生成碘酸。它是碘钟反应反应物之一，有时可用于食盐加碘。

An iodate is a conjugate base of iodic acid. In the iodate anion, iodine is bonded to three oxygen atoms and the molecular formula is IO−
3. The molecular geometry of iodate is trigonal pyramidal.

Iodate can be obtained by reducing periodate with a thioether. The byproduct of the reaction is a sulfoxide.