Písek (Polish: Piosekⓘ, German: Piosek) is a municipality and village in Frýdek-Místek District in the Moravian-Silesian Region of the Czech Republic.

It lies in the historical region of Cieszyn Silesia, a small part of the municipality borders with Poland.

The highest point is the mountain Kyčera/Kiczory on the Czech-Polish border at 989 m (3,245 ft) above sea level.

Historians presume that on the basis of establishment date of nearby Bukowiec (1353).

According to the censuses conducted in 1880–1910 the population of the municipality grew from 884 in 1880 to 1,055 in 1910 with a majority being native Polish-speakers (dropping from 100% in 1880 to 97.5% in 1910) accompanied by German-speaking (at most 2.5% in 1910) and Czech-speaking people (at most 1.1% in 1910).

Following the Munich Agreement, in October 1938 together with the Trans-Olza region it was annexed by Poland, administratively adjoined to Cieszyn County of Silesian Voivodeship.