The Świętokrzyskie Voivodeship Sejmik is the regional legislature of the voivodeship of Świętokrzyskie, Poland. It is a unicameral body consists of thirty councillors elected in free elections for a five-year term. The current chairperson of the assembly is Arkadiusz Bąk of the PSL.

A voivodeship sejmik, also known as a provincial or regional assembly, is the regional-level elected legislature for each of the sixteen voivodeships of Poland. Sejmiks are elected to five-year terms, decided during nationwide local elections. The size of the legislative assembly varies for each voivodeship depending on the population, ranging from 30 members in lower populated provinces to 51 members in the most populous one. Elected representatives of an assembly are known as councillors (radni).