Sâncrăieni (Hungarian: Csíkszentkirály or colloquially Szentkirály, Hungarian pronunciation: [ˈtʃiːksɛnkiraːj], German: Heilkönig, both meaning "holy king" and referring to King St Stephen of Hungary) is a commune in Harghita County, Romania.

Composed of a single village, Sâncrăieni, it lies in the Székely Land, an ethno-cultural region in eastern Transylvania.

It lies just in front of the Jigod pass which divides the Ciuc basin into its upper and lower part.

In 1954, in a nearby andesite mine a Dacian silver treasure and a drinking set was found.

In the papal tithe register of 1332-1337, the village was mentioned by the name of Sanctus Rex as a settlement having a parish.

The famous Hungarian noble family, the Counts Andrássy de Csíkszentkirály et Krasznahorka originated in the village.